diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/core/SkDrawLooper.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/core/SkDrawLooper.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkDrawLooper.h"
+#include "SkCanvas.h"
+#include "SkMatrix.h"
+#include "SkPaint.h"
+#include "SkRect.h"
+#include "SkSmallAllocator.h"
+
+bool SkDrawLooper::canComputeFastBounds(const SkPaint& paint) const {
+    SkCanvas canvas;
+    SkSmallAllocator<1, 32> allocator;
+    void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize());
+
+    SkDrawLooper::Context* context = this->createContext(&canvas, buffer);
+    for (;;) {
+        SkPaint p(paint);
+        if (context->next(&canvas, &p)) {
+            p.setLooper(NULL);
+            if (!p.canComputeFastBounds()) {
+                return false;
+            }
+        } else {
+            break;
+        }
+    }
+    return true;
+}
+
+void SkDrawLooper::computeFastBounds(const SkPaint& paint, const SkRect& src,
+                                     SkRect* dst) const {
+    SkCanvas canvas;
+    SkSmallAllocator<1, 32> allocator;
+    void* buffer = allocator.reserveT<SkDrawLooper::Context>(this->contextSize());
+
+    *dst = src;   // catch case where there are no loops
+    SkDrawLooper::Context* context = this->createContext(&canvas, buffer);
+    for (bool firstTime = true;; firstTime = false) {
+        SkPaint p(paint);
+        if (context->next(&canvas, &p)) {
+            SkRect r(src);
+
+            p.setLooper(NULL);
+            p.computeFastBounds(r, &r);
+            canvas.getTotalMatrix().mapRect(&r);
+
+            if (firstTime) {
+                *dst = r;
+            } else {
+                dst->join(r);
+            }
+        } else {
+            break;
+        }
+    }
+}