[Android WebView] Implement Ubercomp for Render Thread support

content/public/browser/android/synchronous_compositor.h

 // 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_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "gpu/command_buffer/service/in_process_command_buffer.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 class SkCanvas;
 
+namespace cc {
+class CompositorFrame;
+class CompositorFrameAck;
+}
+
 namespace gfx {
 class GLSurface;
 class Transform;
 };
 
+namespace gpu {
+class GLInProcessContext;
+}
+
 namespace content {
 
+class SynchronousCompositorClient;
 class WebContents;
 
-class SynchronousCompositorClient;
-
 struct CONTENT_EXPORT SynchronousCompositorMemoryPolicy {
   // Memory limit for rendering and pre-rendering.
   size_t bytes_limit;
 
   // Limit of number of GL resources used for rendering and pre-rendering.
   size_t num_resources_limit;
 
   SynchronousCompositorMemoryPolicy();
 
   bool operator==(const SynchronousCompositorMemoryPolicy& other) const;
@@ skipping 24 matching lines @@
   // first created or after ReleaseHwDraw is called. It is invalid to
   // DemandDrawHw before this returns true. |surface| is the GLSurface that
   // should be used to create the underlying hardware context.
   virtual bool InitializeHwDraw(scoped_refptr<gfx::GLSurface> surface) = 0;
 
   // Reverse of InitializeHwDraw above. Can only be called while hardware draw
   // is already initialized. Brings compositor back to software only mode and
   // 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(
-      gfx::Size surface_size,
-      const gfx::Transform& transform,
-      gfx::Rect viewport,
-      gfx::Rect clip,
-      bool stencil_enabled) = 0;
+  virtual bool DemandDrawHw(gfx::Size surface_size,
+                            const gfx::Transform& transform,
+                            gfx::Rect viewport,
+                            gfx::Rect clip,
+                            bool stencil_enabled,
+                            cc::CompositorFrame* frame) = 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;
 
   // Set the memory limit policy of this compositor.
   virtual void SetMemoryPolicy(
       const SynchronousCompositorMemoryPolicy& policy) = 0;
 
   // Should be called by the embedder after the embedder had modified the
   // scroll offset of the root layer (as returned by
   // SynchronousCompositorClient::GetTotalRootLayerScrollOffset).
   virtual void DidChangeRootLayerScrollOffset() = 0;
 
  protected:
   virtual ~SynchronousCompositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_