Hookup android_webview scroll offset delegation to Java side.

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index 52f917e9345c653f15fa53e4a78b6d3899d5ffcc..dad70edc8049d6b83797d3e806e3cb540cfda2c5 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -8,6 +8,7 @@
 #include "base/android/scoped_java_ref.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/vector2d_f.h"
 
 struct AwDrawGLInfo;
 struct AwDrawSWFunctionTable;
@@ -16,10 +17,6 @@ namespace content {
 class ContentViewCore;
 }
 
-namespace gfx {
-class Rect;
-}
-
 namespace android_webview {
 
 // Interface for all the WebView-specific content rendering operations.
@@ -43,6 +40,9 @@ class BrowserViewRenderer {
     // Called to get view's absolute location on the screen.
     virtual gfx::Point GetLocationOnScreen() = 0;
 
+    // Try to set the view's scroll offset to |new_value|.
+    virtual void ScrollContainerViewTo(gfx::Vector2d new_value) = 0;
+
    protected:
     virtual ~Client() {}
   };
@@ -88,7 +88,7 @@ class BrowserViewRenderer {
   // scroll offset. |clip| is the canvas's clip bounds.
   virtual bool OnDraw(jobject java_canvas,
                       bool is_hardware_canvas,
-                      const gfx::Point& scroll,
+                      const gfx::Vector2d& scroll,
                       const gfx::Rect& clip) = 0;
   // Called in response to a prior Client::RequestDrawGL() call. See
   // AwDrawGLInfo documentation for more details of the contract.
@@ -104,6 +104,12 @@ class BrowserViewRenderer {
   virtual void OnAttachedToWindow(int width, int height) = 0;
   virtual void OnDetachedFromWindow() = 0;
 
+  // Sets the scale for logical<->physical pixel conversions.
+  virtual void SetDipScale(float dip_scale) = 0;
+
+  // Set the root layer scroll offset to |new_value|.
+  virtual void ScrollTo(gfx::Vector2d new_value) = 0;
+
   // Android views hierarchy gluing.
   virtual bool IsAttachedToWindow() = 0;
   virtual bool IsViewVisible() = 0;