Add Vector2d classes that represent offsets, instead of using Point.

content/port/browser/render_widget_host_view_port.h

Index: content/port/browser/render_widget_host_view_port.h
diff --git a/content/port/browser/render_widget_host_view_port.h b/content/port/browser/render_widget_host_view_port.h
index ef4f507bf5a38a3bc2ebb52aacac8896c8f35c96..ffa1b6d0ad4f2e1fa11b654ccaa7e278e12c2242 100644
--- a/content/port/browser/render_widget_host_view_port.h
+++ b/content/port/browser/render_widget_host_view_port.h
@@ -79,7 +79,7 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView {
   // Moves all plugin windows as described in the given list.
   // |scroll_offset| is the scroll offset of the render view.
   virtual void MovePluginWindows(
-      const gfx::Point& scroll_offset,
+      const gfx::Vector2d& scroll_offset,
       const std::vector<webkit::npapi::WebPluginGeometry>& moves) = 0;
 
   // Take focus from the associated View component.
@@ -229,7 +229,7 @@ class CONTENT_EXPORT RenderWidgetHostViewPort : public RenderWidgetHostView {
 #if defined(OS_ANDROID)
   virtual void SetCachedPageScaleFactorLimits(float minimum_scale,
                                               float maximum_scale) = 0;
-  virtual void UpdateFrameInfo(const gfx::Point& scroll_offset,
+  virtual void UpdateFrameInfo(const gfx::Vector2d& scroll_offset,
                                float page_scale_factor,
                                const gfx::Size& content_size) = 0;
   virtual void HasTouchEventHandlers(bool need_touch_events) = 0;