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

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index 33d9832cf69ce6f50d356cc756e60ada57f9d7c9..5d8d44913bc764e23c879d2c873ee8b3bfa53b2b 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -637,7 +637,7 @@ RenderWidgetHostViewWin::GetNativeViewAccessible() {
 }
 
 void RenderWidgetHostViewWin::MovePluginWindows(
-    const gfx::Point& scroll_offset,
+    const gfx::Vector2d& scroll_offset,
     const std::vector<webkit::npapi::WebPluginGeometry>& plugin_window_moves) {
   MovePluginWindowsHelper(m_hWnd, plugin_window_moves);
 }
@@ -814,9 +814,8 @@ void RenderWidgetHostViewWin::Redraw() {
   RedrawWindow(NULL, damage_region, RDW_UPDATENOW | RDW_NOCHILDREN);
 
   // Send the invalid rect in screen coordinates.
-  gfx::Rect screen_rect = GetViewBounds();
   gfx::Rect invalid_screen_rect(damage_bounds);
-  invalid_screen_rect.Offset(screen_rect.x(), screen_rect.y());
+  invalid_screen_rect.Offset(GetViewBounds().OffsetFromOrigin());
 
   PaintPluginWindowsHelper(m_hWnd, invalid_screen_rect);
 }