Enable texture readback support for Android

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index 81f003606110211a4885ba6de2eb202c67d24fb1..b7b5ef0f7767293b6325c4adc6b1d4750817a32b 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -13,6 +13,7 @@
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebExternalTextureLayer.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 #include "ui/gfx/size.h"
 
 struct ViewHostMsg_TextInputState_Params;
@@ -134,6 +135,9 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
 
   int GetNativeImeAdapter();
 
+  WebKit::WebGLId GetScaledContentTexture(const gfx::Size& size);
+  bool PopulateBitmapWithContents(jobject jbitmap);
+
   // Select all text between the given coordinates.
   void SelectRange(const gfx::Point& start, const gfx::Point& end);
 
@@ -159,6 +163,9 @@ class RenderWidgetHostViewAndroid : public RenderWidgetHostViewBase {
   // The texture layer for this view when using browser-side compositing.
   scoped_ptr<WebKit::WebExternalTextureLayer> texture_layer_;
 
+  // The most recent texture id that was pushed to the texture layer.
+  unsigned int texture_id_in_layer_;
+
   // The handle for the transport surface (between renderer and browser-side
   // compositor) for this view.
   gfx::GLSurfaceHandle shared_surface_;