diff -r 000000000000 -r 6474c204b198 dom/browser-element/mochitest/browserElement_SetInputMethodActive.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/browser-element/mochitest/browserElement_SetInputMethodActive.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,178 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 905573 - Add setInputMethodActive to browser elements to allow gaia
+// system set the active IME app.
+'use strict';
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.addPermission();
+
+function setup() {
+  let appInfo = SpecialPowers.Cc['@mozilla.org/xre/app-info;1']
+                .getService(SpecialPowers.Ci.nsIXULAppInfo);
+  if (appInfo.name != 'B2G') {
+    SpecialPowers.Cu.import("resource://gre/modules/Keyboard.jsm", window);
+  }
+
+  SpecialPowers.setBoolPref("dom.mozInputMethod.enabled", true);
+  SpecialPowers.setBoolPref("dom.mozInputMethod.testing", true);
+  SpecialPowers.addPermission('input-manage', true, document);
+}
+
+function tearDown() {
+  SpecialPowers.setBoolPref("dom.mozInputMethod.enabled", false);
+  SpecialPowers.setBoolPref("dom.mozInputMethod.testing", false);
+  SpecialPowers.removePermission('input-manage', document);
+  SimpleTest.finish();
+}
+
+function runTest() {
+  let path = location.pathname;
+  let imeUrl = location.protocol + '//' + location.host +
+               path.substring(0, path.lastIndexOf('/')) +
+               '/file_inputmethod.html';
+  SpecialPowers.pushPermissions([{
+    type: 'input',
+    allow: true,
+    context: {
+      url: imeUrl,
+      appId: SpecialPowers.Ci.nsIScriptSecurityManager.NO_APP_ID,
+      isInBrowserElement: true
+    }
+  }], createFrames);
+}
+
+var gFrames = [];
+var gInputFrame;
+
+function createFrames() {
+  // Create two input method iframes.
+  let loadendCount = 0;
+  let countLoadend = function() {
+    ok(this.setInputMethodActive, 'Can access setInputMethodActive.');
+
+    if (this === gInputFrame) {
+      // The frame script running in the frame where the input is hosted.
+      let appFrameScript = function appFrameScript() {
+        let input = content.document.body.firstElementChild;
+        input.oninput = function() {
+          sendAsyncMessage('test:InputMethod:oninput', this.value);
+        };
+
+        /*
+         * Bug 957213. Sometimes we need to refocus the input field to avoid
+         * intermittent test failure.
+         */
+        content.setInterval(function() {
+          input.focus();
+        }, 500);
+      }
+
+      // Inject frame script to receive input.
+      let mm = SpecialPowers.getBrowserFrameMessageManager(gInputFrame);
+      mm.loadFrameScript('data:,(' + appFrameScript.toString() + ')();', false);
+      mm.addMessageListener("test:InputMethod:oninput", next);
+    }
+
+    loadendCount++;
+    if (loadendCount === 3) {
+      startTest();
+    }
+  };
+
+  // Create an input field to receive string from input method iframes.
+  gInputFrame = document.createElement('iframe');
+  SpecialPowers.wrap(gInputFrame).mozbrowser = true;
+  gInputFrame.src =
+    'data:text/html,<input autofocus value="hello" />' +
+    '<p>This is targetted mozbrowser frame.</p>';
+  document.body.appendChild(gInputFrame);
+  gInputFrame.addEventListener('mozbrowserloadend', countLoadend);
+
+  for (let i = 0; i < 2; i++) {
+    let frame = gFrames[i] = document.createElement('iframe');
+    SpecialPowers.wrap(gFrames[i]).mozbrowser = true;
+    // When the input method iframe is activated, it will send the URL
+    // hash to current focused element. We set different hash to each
+    // iframe so that iframes can be differentiated by their hash.
+    frame.src = 'file_inputmethod.html#' + i;
+    document.body.appendChild(frame);
+    frame.addEventListener('mozbrowserloadend', countLoadend);
+  }
+}
+
+function startTest() {
+  // Set focus to the input field and wait for input methods' inputting.
+  SpecialPowers.DOMWindowUtils.focus(gInputFrame);
+
+  let req0 = gFrames[0].setInputMethodActive(true);
+  req0.onsuccess = function() {
+    ok(true, 'setInputMethodActive succeeded (0).');
+  };
+
+  req0.onerror = function() {
+    ok(false, 'setInputMethodActive failed (0): ' + this.error.name);
+  };
+}
+
+var gTimerId = null;
+var gCount = 0;
+
+function next(msg) {
+  gCount++;
+  let wrappedMsg = SpecialPowers.wrap(msg);
+  let value = wrappedMsg.data;
+  // The texts sent from the first and the second input method are '#0' and
+  // '#1' respectively.
+  switch (gCount) {
+    case 1:
+      is(value, '#0hello',
+         'Failed to get correct input from the first iframe.');
+      let req1 = gFrames[1].setInputMethodActive(true);
+      req1.onsuccess = function() {
+       ok(true, 'setInputMethodActive succeeded (1).');
+      };
+      req1.onerror = function() {
+       ok(false, 'setInputMethodActive failed (1): ' + this.error.name);
+      };
+      break;
+
+    case 2:
+      is(value, '#0#1hello',
+         'Failed to get correct input from the second iframe.');
+      // Do nothing and wait for the next input from the second iframe.
+      break;
+
+    case 3:
+      is(value, '#0#1#1hello',
+         'Failed to get correct input from the second iframe.');
+      // Receive the second input from the second iframe.
+      // Deactive the second iframe.
+      let req3 = gFrames[1].setInputMethodActive(false);
+      req3.onsuccess = function() {
+        ok(true, 'setInputMethodActive(false) succeeded (3).');
+      };
+      req3.onerror = function() {
+        ok(false, 'setInputMethodActive(false) failed (3): ' + this.error.name);
+      };
+
+      // Wait for a short while to ensure the second iframe is not active any
+      // more.
+      gTimerId = setTimeout(function() {
+        ok(true, 'Successfully deactivate the second iframe.');
+        tearDown();
+      }, 1000);
+      break;
+
+    case 4:
+      ok(false, 'Failed to deactivate the second iframe in time.');
+      clearTimeout(gTimerId);
+      tearDown();
+      break;
+  }
+}
+
+setup();
+addEventListener('testready', runTest);