[Master/Overview CL] Make PageScaleFactor work for oopif subframe.

cc/trees/layer_tree.h

Index: cc/trees/layer_tree.h
diff --git a/cc/trees/layer_tree.h b/cc/trees/layer_tree.h
index 5e433c2e3639a89668ec31e875e679a3f41140a8..98688be9a211e106c3e1cabebfa196f386964d35 100644
--- a/cc/trees/layer_tree.h
+++ b/cc/trees/layer_tree.h
@@ -101,7 +101,11 @@ class CC_EXPORT LayerTree : public MutatorHostClient {
   void SetPageScaleFactorAndLimits(float page_scale_factor,
                                    float min_page_scale_factor,
                                    float max_page_scale_factor);
+  void SetSubframePageScaleFactor(float subframe_page_scale_factor);
   float page_scale_factor() const { return inputs_.page_scale_factor; }
+  float subframe_page_scale_factor() const {
+    return inputs_.subframe_page_scale_factor;
+  }
 
   void set_background_color(SkColor color) { inputs_.background_color = color; }
   SkColor background_color() const { return inputs_.background_color; }
@@ -258,6 +262,7 @@ class CC_EXPORT LayerTree : public MutatorHostClient {
     float device_scale_factor;
     float painted_device_scale_factor;
     float page_scale_factor;
+    float subframe_page_scale_factor;
     float min_page_scale_factor;
     float max_page_scale_factor;
     gfx::ColorSpace device_color_space;