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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 19623cf5537d474f667f5ecc96548afffcbb2be5..d131efc1ac1c972689a57b128b16ec169bee93cd 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -416,7 +416,7 @@ gfx::NativeViewAccessible RenderWidgetHostViewAura::GetNativeViewAccessible() {
 }
 
 void RenderWidgetHostViewAura::MovePluginWindows(
-    const gfx::Point& scroll_offset,
+    const gfx::Vector2d& scroll_offset,
     const std::vector<webkit::npapi::WebPluginGeometry>& plugin_window_moves) {
 #if defined(OS_WIN)
   // We need to clip the rectangle to the tab's viewport, otherwise we will draw
@@ -438,7 +438,7 @@ void RenderWidgetHostViewAura::MovePluginWindows(
     clip.Offset(scroll_offset);
     clip.Intersect(view_port);
     clip.Offset(-moves[i].window_rect.x(), -moves[i].window_rect.y());
-    clip.Offset(-scroll_offset.x(), -scroll_offset.y());
+    clip.Offset(-scroll_offset);
     moves[i].clip_rect = clip;
 
     moves[i].window_rect.Offset(view_bounds.origin());