Fix frame coordinate translation issue with scroll views.

third_party/WebKit/Source/web/WebPluginContainerImpl.cpp

Index: third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp b/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
index 7802cd487bbc30deeef86de85c1bef7fb4cb9b58..0df3c95919b96add10d2e2eb5f10f0156a943e12 100644
--- a/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebPluginContainerImpl.cpp
@@ -830,9 +830,18 @@ void WebPluginContainerImpl::HandleTouchEvent(TouchEvent* event) {
       WebTouchEvent transformed_event =
           event->NativeEvent()->FlattenTransform();
 
+      FrameView* view = ToFrameView(Parent());
+
       for (unsigned i = 0; i < transformed_event.touches_length; ++i) {
         WebFloatPoint absolute_root_frame_location =
             transformed_event.touches[i].position;
+
+        // Translate the absolute position to content coordinates.
+        if (view) {
+          absolute_root_frame_location =
+              view->RootFrameToContents(absolute_root_frame_location);
+        }
+
         IntPoint local_point =
             RoundedIntPoint(element_->GetLayoutObject()->AbsoluteToLocal(
                 absolute_root_frame_location, kUseTransforms));