[ MimeHandlerView ] (frame-based MHV) postMessage

This CL hooks up post messaging API for frame-based MimeHandlerView. A
current post message test which runs only for BrowserPlugin version is
now modified to run for frame-based MimeHandlerView as well.

Bug: 659750
Change-Id: Ie58fa733f463e697e38a100f78e0e50e7431b983
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539869Reviewed-by: James MacLean <wjmaclean@chromium.org>
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644640}

extensions/browser/guest_view/mime_handler_view/mime_handler_view_browsertest.cc

@@ -362,7 +362,7 @@ IN_PROC_BROWSER_TEST_P(MimeHandlerViewCrossProcessTest,
 // The following tests will eventually converted into a parametric version which
 // will run on both BrowserPlugin-based and cross-process-frame-based
 // MimeHandlerView (https://crbug.com/659750).
-IN_PROC_BROWSER_TEST_F(MimeHandlerViewTest, PostMessage) {
+IN_PROC_BROWSER_TEST_P(MimeHandlerViewCrossProcessTest, PostMessage) {
   RunTest("test_postmessage.html");
 }
 

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.cc

@@ -88,7 +88,7 @@ void MimeHandlerViewContainer::DidResizeElement(const gfx::Size& new_size) {
 
 v8::Local<v8::Object> MimeHandlerViewContainer::V8ScriptableObject(
     v8::Isolate* isolate) {
-  return GetScriptableObject(isolate);
+  return GetScriptableObjectInternal(isolate);
 }
 
 void MimeHandlerViewContainer::OnCreateMimeHandlerViewGuestACK(

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container_base.cc

@@ -399,7 +399,7 @@ void MimeHandlerViewContainerBase::SetEmbeddedLoader(
   CreateMimeHandlerViewGuestIfNecessary();
 }
 
-v8::Local<v8::Object> MimeHandlerViewContainerBase::GetScriptableObject(
+v8::Local<v8::Object> MimeHandlerViewContainerBase::GetScriptableObjectInternal(
     v8::Isolate* isolate) {
   if (scriptable_object_.IsEmpty()) {
     v8::Local<v8::Object> object =

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container_base.h

@@ -76,7 +76,7 @@ class MimeHandlerViewContainerBase : public blink::WebAssociatedURLLoaderClient,
   void DidLoadInternal();
   void SendResourceRequest();
   void EmbedderRenderFrameWillBeGone();
-  v8::Local<v8::Object> GetScriptableObject(v8::Isolate* isolate);
+  v8::Local<v8::Object> GetScriptableObjectInternal(v8::Isolate* isolate);
 
   // Returns the frame which is embedding the corresponding plugin element.
   content::RenderFrame* GetEmbedderRenderFrame() const;

extensions/renderer/guest_view/mime_handler_view/mime_handler_view_frame_container.cc

@@ -68,7 +68,15 @@ bool MimeHandlerViewFrameContainer::Create(
 v8::Local<v8::Object> MimeHandlerViewFrameContainer::GetScriptableObject(
     const blink::WebElement& plugin_element,
     v8::Isolate* isolate) {
-  // TODO(ekaramad): Implement.
+  auto containers = FromRenderFrame(content::RenderFrame::FromWebFrame(
+      plugin_element.GetDocument().GetFrame()));
+  for (auto* container : containers) {
+    auto* frame_container =
+        static_cast<MimeHandlerViewFrameContainer*>(container);
+    if (frame_container->plugin_element_ != plugin_element)
+      continue;
+    return frame_container->GetScriptableObjectInternal(isolate);
+  }
   return v8::Local<v8::Object>();
 }