Hookup android_webview scroll offset delegation to Java side.

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_IN_PROCESS_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_IN_PROCESS_IN_PROCESS_VIEW_RENDERER_H_
 
 #include "android_webview/browser/browser_view_renderer.h"
 
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/android/synchronous_compositor_client.h"
+#include "ui/gfx/vector2d_f.h"
 
 namespace content {
 class SynchronousCompositor;
 class WebContents;
 }
 
 typedef void* EGLContext;
 class SkCanvas;
 
 namespace android_webview {
 
 // Provides RenderViewHost wrapper functionality for sending WebView-specific
 // IPC messages to the renderer and from there to WebKit.
 class InProcessViewRenderer : public BrowserViewRenderer,
                               public content::SynchronousCompositorClient {
  public:
   InProcessViewRenderer(BrowserViewRenderer::Client* client,
                         JavaHelper* java_helper);
   virtual ~InProcessViewRenderer();
 
   static InProcessViewRenderer* FromWebContents(
       content::WebContents* contents);
 
   // BrowserViewRenderer overrides
   virtual void SetContents(
       content::ContentViewCore* content_view_core) OVERRIDE;
   virtual bool OnDraw(jobject java_canvas,
                       bool is_hardware_canvas,
-                      const gfx::Point& scroll,
+                      const gfx::Vector2d& scroll_pix,
                       const gfx::Rect& clip) OVERRIDE;
   virtual void DrawGL(AwDrawGLInfo* draw_info) OVERRIDE;
   virtual base::android::ScopedJavaLocalRef<jobject> CapturePicture() OVERRIDE;
   virtual void EnableOnNewPicture(bool enabled) OVERRIDE;
   virtual void OnVisibilityChanged(
       bool view_visible, bool window_visible) OVERRIDE;
   virtual void OnSizeChanged(int width, int height) OVERRIDE;
+  virtual void ScrollTo(gfx::Vector2dF new_value_css) OVERRIDE;

[joth, 2013/06/18 03:19:50]

ah ha! over here you call it CSS pixels :)

[mkosiba (inactive), 2013/06/18 18:09:25]

see? making it explicit is paying off already :)

   virtual void OnAttachedToWindow(int width, int height) OVERRIDE;
   virtual void OnDetachedFromWindow() OVERRIDE;
   virtual bool IsAttachedToWindow() OVERRIDE;
   virtual bool IsViewVisible() OVERRIDE;
   virtual gfx::Rect GetScreenRect() OVERRIDE;
 
   // SynchronousCompositorClient overrides
   virtual void DidInitializeCompositor(
       content::SynchronousCompositor* compositor) OVERRIDE;
   virtual void DidDestroyCompositor(
@@ skipping 30 matching lines @@
 
   bool attached_to_window_;
   bool hardware_initialized_;
   bool hardware_failed_;
 
   // Used only for detecting Android View System context changes.
   // Not to be used between draw calls.
   EGLContext egl_context_at_init_;
 
   // Last View scroll when View.onDraw() was called.
-  gfx::Point scroll_at_start_of_frame_;
+  gfx::Vector2d scroll_at_start_of_frame_pix_;
 
-  gfx::Vector2dF scroll_offset_;
+  // Current scroll offset in CSS pixels.
+  gfx::Vector2dF scroll_offset_css_;
 
   base::WeakPtrFactory<InProcessViewRenderer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_IN_PROCESS_IN_PROCESS_VIEW_RENDERER_H_