Implement external stencil for Android WebView

android_webview/browser/hardware_renderer.h

 // Copyright 2014 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 ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_
 
 #include "android_webview/browser/shared_renderer_state.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/surfaces/display_client.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "cc/surfaces/surface_id.h"
 
 struct AwDrawGLInfo;
 
 namespace cc {
 class Display;
 class SurfaceFactory;
 class SurfaceIdAllocator;
 class SurfaceManager;
 }
 
 namespace android_webview {
 
 class AwGLSurface;
 class ChildFrame;
 class ParentOutputSurface;
+class ScopedAppGLStateRestore;
 
 class HardwareRenderer : public cc::DisplayClient,
                          public cc::SurfaceFactoryClient {
  public:
   explicit HardwareRenderer(SharedRendererState* state);
   ~HardwareRenderer() override;
 
-  void DrawGL(bool stencil_enabled,
-              AwDrawGLInfo* draw_info);
+  void DrawGL(AwDrawGLInfo* draw_info, const ScopedAppGLStateRestore& gl_state);
   void CommitFrame();
 
   void SetBackingFrameBufferObject(int framebuffer_binding_ext);
 
  private:
   // cc::DisplayClient overrides.
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval) override {}
   void OutputSurfaceLost() override {}
   void SetMemoryPolicy(const cc::ManagedMemoryPolicy& policy) override {}
@@ skipping 35 matching lines @@
 
   // This is owned by |display_|.
   ParentOutputSurface* output_surface_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_