Hardcode scrollbar rendering for Android

cc/hardcoded_scrollbar.h

+// Copyright 2011 The Chromium Authors. All rights reserved.

[danakj, 2013/02/05 17:55:02]

2013

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_HARDCODED_SCROLLBAR_H_
+#define CC_HARDCODED_SCROLLBAR_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/time.h"
+#include "build/build_config.h"
+#include "ui/gfx/vector2d.h"
+
+namespace cc {
+
+class LayerTreeHostImpl;
+class RenderPass;
+class SharedQuadState;
+
+#if defined(OS_ANDROID)
+// FIXME(trchen): This class a quick hack scrollbar for Android for M25.
+// Need to disable WebKit-side scrollbar for now because sublayer
+// scrollbars aren't coordinated in the compositor, and the update latency is
+// too long when impl-side painting is enabled. We should remove this hack
+// after implementing the coordinator for sublayer scrollbars.
+class HardcodedScrollbar {
+public:
+  HardcodedScrollbar(LayerTreeHostImpl* layer_tree_host_impl);

[danakj, 2013/02/05 17:55:02]

1 space before this

+  void Animate(base::TimeTicks monotonic_time);
+  void PrependQuads(RenderPass* render_pass);
+  void DidPinchGestureUpdate(base::TimeTicks monotonic_time);
+  void DidPinchGestureEnd(base::TimeTicks monotonic_time);
+  void DidUpdateScrollOffset(base::TimeTicks monotonic_time);
+private:
+  LayerTreeHostImpl* layer_tree_host_impl_;

[danakj, 2013/02/05 17:55:02]

1 space

+
+  float opacity_;
+  bool pinch_in_effect_;
+  gfx::Vector2dF last_scroll_offset_;
+  base::TimeTicks last_awaken_time_;
+};
+#else
+// This is a dummy class for platforms that don't need a hardcoded scrollbar.
+// Everything is inlined for zero overhead.
+class HardcodedScrollbar {
+public:

[danakj, 2013/02/05 17:55:02]

1 space

+  inline HardcodedScrollbar(LayerTreeHostImpl*) { }

[danakj, 2013/02/05 17:55:02]

no space between {}s

+  inline void Animate(base::TimeTicks) { }

[danakj, 2013/02/05 17:55:02]

variables should still get names i believe

+  inline void PrependQuads(RenderPass*) { }
+  inline void DidPinchGestureUpdate(base::TimeTicks) { }
+  inline void DidPinchGestureEnd(base::TimeTicks) { }
+  inline void DidUpdateScrollOffset(base::TimeTicks) { }
+};
+#endif
+
+}  // namespace cc
+
+#endif  // CC_HARDCODED_SCROLLBAR_H_