[Contextual Search] Add support for crushed sprites and animate the search provider icon

chrome/browser/android/compositor/layer/crushed_sprite_layer.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_CRUSHED_SPRITE_LAYER_H_
+#define CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_CRUSHED_SPRITE_LAYER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/android/compositor/layer/layer.h"
+
+namespace cc {
+class UIResourceLayer;
+}
+
+namespace ui {
+class CrushedSpriteResource;
+class ResourceManager;
+}
+
+namespace chrome {
+namespace android {
+
+// A layer which manages drawing frames from a CrushedSpriteResource into an
+// SkCanvas backed by an SkBitmap. The final SkBitmap is passed to a
+// UIResourceLayer for display.
+class CrushedSpriteLayer : public Layer {
+ public:
+  static scoped_refptr<CrushedSpriteLayer> Create(
+      ui::ResourceManager* resource_manager);
+
+  // Sets the CrushedSpriteResource to draw from.
+  void SetCrushedSpriteResource(
+      scoped_refptr<ui::CrushedSpriteResource> resource);
+
+  // Draws the rectangles for |sprite_frame| on top of the previous frame and
+  // sends to layer_ for display.
+  void DrawSpriteFrame(int sprite_frame);
+
+  // Layer overrides.
+  scoped_refptr<cc::Layer> layer() override;
+
+ protected:
+  explicit CrushedSpriteLayer(ui::ResourceManager* resource_manager);
+  ~CrushedSpriteLayer() override;
+
+ private:
+  // Draws the rectangles for |frame| to |canvas|.
+  void DrawRectanglesForFrame(int frame, SkCanvas* canvas);
+
+  ui::ResourceManager* resource_manager_;
+  scoped_refptr<cc::UIResourceLayer> layer_;
+  scoped_refptr<ui::CrushedSpriteResource> resource_;

[David Trainor- moved to gerrit, 2015/10/15 21:04:57]

I think nobody else holds onto resources.  We set the relevant data then drop
it?

[Theresa, 2015/10/24 00:06:45]

Done.

+  int previous_frame_;
+  SkBitmap previous_frame_bitmap_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrushedSpriteLayer);
+};
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_CRUSHED_SPRITE_LAYER_H_