diff -r 000000000000 -r 6474c204b198 widget/android/nsScreenManagerAndroid.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/android/nsScreenManagerAndroid.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define MOZ_FATAL_ASSERTIONS_FOR_THREAD_SAFETY
+
+#include "nsScreenManagerAndroid.h"
+#include "nsWindow.h"
+#include "AndroidBridge.h"
+
+using namespace mozilla;
+
+nsScreenAndroid::nsScreenAndroid(void *nativeScreen)
+{
+}
+
+nsScreenAndroid::~nsScreenAndroid()
+{
+}
+
+NS_IMETHODIMP
+nsScreenAndroid::GetRect(int32_t *outLeft, int32_t *outTop, int32_t *outWidth, int32_t *outHeight)
+{
+    gfxIntSize sz = nsWindow::GetAndroidScreenBounds();
+
+    *outLeft = 0;
+    *outTop = 0;
+
+    *outWidth = sz.width;
+    *outHeight = sz.height;
+
+    return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsScreenAndroid::GetAvailRect(int32_t *outLeft, int32_t *outTop, int32_t *outWidth, int32_t *outHeight)
+{
+    return GetRect(outLeft, outTop, outWidth, outHeight);
+}
+
+
+
+NS_IMETHODIMP
+nsScreenAndroid::GetPixelDepth(int32_t *aPixelDepth)
+{
+    *aPixelDepth = AndroidBridge::Bridge()->GetScreenDepth();
+    return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsScreenAndroid::GetColorDepth(int32_t *aColorDepth)
+{
+    return GetPixelDepth(aColorDepth);
+}
+
+void
+nsScreenAndroid::ApplyMinimumBrightness(uint32_t aBrightness)
+{
+  mozilla::widget::android::GeckoAppShell::SetKeepScreenOn(aBrightness == BRIGHTNESS_FULL);
+}
+
+NS_IMPL_ISUPPORTS(nsScreenManagerAndroid, nsIScreenManager)
+
+nsScreenManagerAndroid::nsScreenManagerAndroid()
+{
+    mOneScreen = new nsScreenAndroid(nullptr);
+}
+
+nsScreenManagerAndroid::~nsScreenManagerAndroid()
+{
+}
+
+NS_IMETHODIMP
+nsScreenManagerAndroid::GetPrimaryScreen(nsIScreen **outScreen)
+{
+    NS_IF_ADDREF(*outScreen = mOneScreen.get());
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenManagerAndroid::ScreenForRect(int32_t inLeft,
+                                      int32_t inTop,
+                                      int32_t inWidth,
+                                      int32_t inHeight,
+                                      nsIScreen **outScreen)
+{
+    return GetPrimaryScreen(outScreen);
+}
+
+NS_IMETHODIMP
+nsScreenManagerAndroid::ScreenForNativeWidget(void *aWidget, nsIScreen **outScreen)
+{
+    return GetPrimaryScreen(outScreen);
+}
+
+NS_IMETHODIMP
+nsScreenManagerAndroid::GetNumberOfScreens(uint32_t *aNumberOfScreens)
+{
+    *aNumberOfScreens = 1;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenManagerAndroid::GetSystemDefaultScale(float *aDefaultScale)
+{
+    *aDefaultScale = 1.0f;
+    return NS_OK;
+}