Specify the rect invalidated by SetLayerTransform.

content/renderer/pepper/pepper_graphics_2d_host.cc

Index: content/renderer/pepper/pepper_graphics_2d_host.cc
diff --git a/content/renderer/pepper/pepper_graphics_2d_host.cc b/content/renderer/pepper/pepper_graphics_2d_host.cc
index ea767e63ea906873500714aef57702a534c5dea5..acfc70fad31b3c4f7252579572d63a8950ece83d 100644
--- a/content/renderer/pepper/pepper_graphics_2d_host.cc
+++ b/content/renderer/pepper/pepper_graphics_2d_host.cc
@@ -610,8 +610,7 @@ int32_t PepperGraphics2DHost::Flush(PP_Resource* old_image_data) {
     gfx::Rect op_rect;
     switch (operation.type) {
       case QueuedOperation::TRANSFORM:
-        ExecuteTransform(operation.scale, operation.translation);
-        no_update_visible = false;
+        ExecuteTransform(operation.scale, operation.translation, &op_rect);
         break;
       case QueuedOperation::PAINT:
         ExecutePaintImageData(operation.paint_image.get(),
@@ -703,8 +702,10 @@ int32_t PepperGraphics2DHost::Flush(PP_Resource* old_image_data) {
 }
 
 void PepperGraphics2DHost::ExecuteTransform(const float& scale,
-                                            const gfx::PointF& translate) {
+                                            const gfx::PointF& translate,
+                                            gfx::Rect* invalidated_rect) {
   bound_instance_->SetGraphics2DTransform(scale, translate);
+  *invalidated_rect = PP_ToGfxRect(bound_instance_->view_data().clip_rect);
 }
 
 void PepperGraphics2DHost::ExecutePaintImageData(PPB_ImageData_Impl* image,