[Android WebView] Implement Ubercomp for Render Thread support

content/public/browser/android/synchronous_compositor.h

Index: content/public/browser/android/synchronous_compositor.h
diff --git a/content/public/browser/android/synchronous_compositor.h b/content/public/browser/android/synchronous_compositor.h
index 1d03278d79b5d8b6a2e9454a7002a53f15afe0e7..5cd659f662e13ad1da9074e9bc81c265c3205ada 100644
--- a/content/public/browser/android/synchronous_compositor.h
+++ b/content/public/browser/android/synchronous_compositor.h
@@ -13,16 +13,24 @@
 
 class SkCanvas;
 
+namespace cc {
+class CompositorFrame;
+class CompositorFrameAck;
+}
+
 namespace gfx {
 class GLSurface;
 class Transform;
 };
 
-namespace content {
+namespace gpu {
+class GLInProcessContext;
+}
 
-class WebContents;
+namespace content {
 
 class SynchronousCompositorClient;
+class WebContents;
 
 struct CONTENT_EXPORT SynchronousCompositorMemoryPolicy {
   // Memory limit for rendering and pre-rendering.
@@ -68,16 +76,25 @@ class CONTENT_EXPORT SynchronousCompositor {
   // releases all hardware resources.
   virtual void ReleaseHwDraw() = 0;
 
+  // Get the share context of the compositor. The returned context is owned
+  // by the compositor and is only valid between InitializeHwDraw and
+  // ReleaseHwDraw.
+  virtual gpu::GLInProcessContext* GetShareContext() = 0;
+
   // "On demand" hardware draw. The content is first clipped to |damage_area|,
   // then transformed through |transform|, and finally clipped to |view_size|
   // and by the existing stencil buffer if any.
-  virtual bool DemandDrawHw(
+  virtual scoped_ptr<cc::CompositorFrame> DemandDrawHw(
       gfx::Size surface_size,
       const gfx::Transform& transform,
       gfx::Rect viewport,
       gfx::Rect clip,
       bool stencil_enabled) = 0;
 
+  // For delegated rendering, return resources from parent compositor to this.
+  // Note that all resources must be returned before ReleaseHwDraw.
+  virtual void ReturnResources(const cc::CompositorFrameAck& frame_ack) = 0;
+
   // "On demand" SW draw, into the supplied canvas (observing the transform
   // and clip set there-in).
   virtual bool DemandDrawSw(SkCanvas* canvas) = 0;