Android WebView: Make a custom Picture subclass

android_webview/browser/in_process_view_renderer.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 ANDROID_WEBVIEW_BROWSER_IN_PROCESS_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_IN_PROCESS_VIEW_RENDERER_H_
 
 #include <string>
 
 #include "android_webview/browser/browser_view_renderer.h"
@@ skipping 18 matching lines @@
                               public content::SynchronousCompositorClient {
  public:
   InProcessViewRenderer(BrowserViewRenderer::Client* client,
                         JavaHelper* java_helper,
                         content::WebContents* web_contents);
   virtual ~InProcessViewRenderer();
 
   static InProcessViewRenderer* FromWebContents(
       content::WebContents* contents);
 
+  // TODO(joth): consider extracting this to its own utility class.

[joth, 2013/08/03 17:38:12]

I left in this .h/.cc for this patch as it makes the diff much easier to follow.
(see the .cc)

+  typedef base::Callback<bool(SkCanvas*)> RenderMethod;
+  static bool RenderViaAuxilaryBitmapIfNeeded(
+      jobject java_canvas,
+      JavaHelper* java_helper,
+      const gfx::Vector2d& scroll_correction,
+      const gfx::Rect& clip,
+      RenderMethod render_source,
+      void* owner_key);
+
   // BrowserViewRenderer overrides
   virtual bool OnDraw(jobject java_canvas,
                       bool is_hardware_canvas,
                       const gfx::Vector2d& scroll_,
                       const gfx::Rect& clip) OVERRIDE;
   virtual void DrawGL(AwDrawGLInfo* draw_info) OVERRIDE;
   virtual void SetGlobalVisibleRect(const gfx::Rect& visible_rect) OVERRIDE;
-  virtual base::android::ScopedJavaLocalRef<jobject> CapturePicture(
-      int width,
-      int height) OVERRIDE;
+  virtual skia::RefPtr<SkPicture> CapturePicture(int width,
+                                                 int height) OVERRIDE;
   virtual void EnableOnNewPicture(bool enabled) OVERRIDE;
   virtual void OnVisibilityChanged(bool visible) OVERRIDE;
   virtual void OnSizeChanged(int width, int height) OVERRIDE;
   virtual void ScrollTo(gfx::Vector2d new_value) OVERRIDE;
   virtual void SetPageScaleFactor(float page_scale_factor) OVERRIDE;
   virtual void OnAttachedToWindow(int width, int height) OVERRIDE;
   virtual void OnDetachedFromWindow() OVERRIDE;
   virtual void SetDipScale(float dip_scale) OVERRIDE;
   virtual bool IsAttachedToWindow() OVERRIDE;
   virtual bool IsViewVisible() OVERRIDE;
@@ skipping 88 matching lines @@
   gfx::Vector2dF overscroll_rounding_error_;
 
   GLViewRendererManager::Key manager_key_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_IN_PROCESS_VIEW_RENDERER_H_