Add a test for Flash Fullscreen from a cross-site subframe.

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 29625e4a049ad9d5f3e9ebfd89b88307133d92e3..452a35ba8f3c3f8592bb0b34829ce5a343abbc99 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -179,6 +179,7 @@ using blink::WebURLResponse;
 using blink::WebUserGestureIndicator;
 using blink::WebUserGestureToken;
 using blink::WebView;
+using blink::WebWidget;
 
 namespace content {
 
@@ -2190,8 +2191,9 @@ void PepperPluginInstanceImpl::HandleMouseLockedInputEvent(
 
 void PepperPluginInstanceImpl::SimulateInputEvent(
     const InputEventData& input_event) {
-  WebView* web_view = container()->document().frame()->view();
-  if (!web_view) {
+  WebWidget* widget =
+      container()->document().frame()->localRoot()->frameWidget();

[alexmos, 2016/07/07 21:17:19]

This function didn't work in OOPIF processes, since the WebView corresponds to a
remote main frame, and it can't be used for processing input events.  I think
the correct thing to use here is the frame's actual widget, which lives in the
local root.

+  if (!widget) {
     NOTREACHED();
     return;
   }
@@ -2207,7 +2209,7 @@ void PepperPluginInstanceImpl::SimulateInputEvent(
   for (std::vector<std::unique_ptr<WebInputEvent>>::iterator it =
            events.begin();
        it != events.end(); ++it) {
-    web_view->handleInputEvent(*it->get());
+    widget->handleInputEvent(*it->get());
   }
 }