Delegate root layer scroll offset to android_webview.

content/renderer/android/synchronous_compositor_impl.h

Index: content/renderer/android/synchronous_compositor_impl.h
diff --git a/content/renderer/android/synchronous_compositor_impl.h b/content/renderer/android/synchronous_compositor_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..79d552422cdf388b1b3e1cf920d61c5e6c7f2bfb
--- /dev/null
+++ b/content/renderer/android/synchronous_compositor_impl.h
@@ -0,0 +1,68 @@
+// Copyright 2013 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 CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_IMPL_H_
+#define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_IMPL_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "cc/input/layer_scroll_offset_delegate.h"
+#include "content/public/renderer/android/synchronous_compositor.h"
+#include "content/renderer/android/synchronous_compositor_output_surface.h"
+
+namespace cc {
+class InputHandler;
+class OutputSurface;
+}
+
+namespace content {
+
+// TODO(mkosiba): Add a comment!
+class SynchronousCompositorImpl
+    : public SynchronousCompositor,
+      public SynchronousCompositorOutputSurface::Delegate,
+      public cc::LayerScrollOffsetDelegate {
+ public:
+  explicit SynchronousCompositorImpl(int32 routing_id);
+  virtual ~SynchronousCompositorImpl();
+
+  scoped_ptr<cc::OutputSurface> CreateOutputSurface();
+  void didCreateInputHandler(base::WeakPtr<cc::InputHandler> input_handler);

[jamesr, 2013/05/22 01:28:13]

why is this function named in WebKit style?

[mkosiba (inactive), 2013/05/22 17:26:17]

no idea. probably because most of the didDoSomething functions I've seen in the
last couple of hours where in WebKit. fixing.

+
+  // SynchronousCompositor
+  virtual bool IsHwReady() OVERRIDE;
+  virtual void SetClient(SynchronousCompositorClient* compositor_client)
+      OVERRIDE;
+  virtual bool DemandDrawSw(SkCanvas* canvas) OVERRIDE;
+  virtual bool DemandDrawHw(
+      gfx::Size view_size,
+      const gfx::Transform& transform,
+      gfx::Rect clip) OVERRIDE;
+
+  // SynchronousCompositorOutputSurface::Delegate
+  virtual void SetContinuousInvalidate(bool enable) OVERRIDE;
+  virtual void DidCreateSynchronousCompositor() OVERRIDE;
+  virtual void DidDestroyCompositor() OVERRIDE;
+
+  // LayerScrollOffsetDelegate
+  virtual void SetTotalScrollOffset(gfx::Vector2dF new_value) OVERRIDE;
+  virtual gfx::Vector2dF GetTotalScrollOffset() OVERRIDE;
+
+ private:
+  bool CalledOnValidThread() const;
+  void didCreateInputHandlerOnImplThread(
+      base::WeakPtr<cc::InputHandler> input_handler);
+
+  int routing_id_;
+  SynchronousCompositorClient* compositor_client_;
+  SynchronousCompositorOutputSurface* output_surface_;
+
+  DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_IMPL_H_