Browser Plugin: Add HTML5-like postMessage support

content/browser/browser_plugin/browser_plugin_host_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/singleton.h"
 #include "base/run_loop.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/browser_plugin/browser_plugin_host_factory.h"
@@ skipping 777 matching lines @@
     content::TitleWatcher title_watcher(test_guest_web_contents,
                                         expected_title);
 
     rvh->ExecuteJavascriptAndGetValue(string16(), ASCIIToUTF16("Go(-2);"));
 
     string16 actual_title = title_watcher.WaitAndGetTitle();
     EXPECT_EQ(expected_title, actual_title);
   }
 }
 
+// This test verifies that round trip postMessage works as expected.
+// 1. The embedder posts a message to the guest.
+// 2. The guest receives and replies to the message using the event object's
+// source object: event.source.postMessage(...)
+// 3. The embedder receives the message and uses the event object's source
+// object to do one final reply.
+// 4. The guest receives the final 'stop' message.
+// 5. The guest acks the 'stop' message with a 'stop_ack' message.
+// 6. The embedder changes its title to 'stop_ack' when it sees the string.

[nasko, 2012/10/02 17:52:31]

It seems that the title is set to "main guest" or "iframe", not "stop_ack".

[Fady Samuel, 2012/10/02 22:04:08]

Stale comment. Updated.

+IN_PROC_BROWSER_TEST_F(BrowserPluginHostTest, PostMessage) {
+  const char* kTesting = "testing123";
+  ASSERT_TRUE(test_server()->Start());
+
+  GURL test_url(test_server()->GetURL("files/browser_plugin_embedder.html"));
+  NavigateToURL(shell(), test_url);
+
+  WebContentsImpl* embedder_web_contents = static_cast<WebContentsImpl*>(
+      shell()->web_contents());
+  RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
+      embedder_web_contents->GetRenderViewHost());
+
+  test_url = test_server()->GetURL(
+      "files/browser_plugin_post_message_guest.html");
+  rvh->ExecuteJavascriptAndGetValue(string16(), ASCIIToUTF16(
+      StringPrintf("SetSrc('%s');", test_url.spec().c_str())));
+
+  // Wait to make sure embedder is created/attached to WebContents.
+  TestBrowserPluginHostFactory::GetInstance()->WaitForEmbedderCreation();
+
+  TestBrowserPluginEmbedder* test_embedder =
+      static_cast<TestBrowserPluginEmbedder*>(
+          embedder_web_contents->GetBrowserPluginEmbedder());
+  ASSERT_TRUE(test_embedder);
+  test_embedder->WaitForGuestAdded();
+
+  // Verify that we have exactly one guest.
+  const BrowserPluginEmbedder::ContainerInstanceMap& instance_map =
+      test_embedder->guest_web_contents_for_testing();
+  EXPECT_EQ(1u, instance_map.size());
+
+  WebContentsImpl* test_guest_web_contents = static_cast<WebContentsImpl*>(
+      instance_map.begin()->second);
+  TestBrowserPluginGuest* test_guest = static_cast<TestBrowserPluginGuest*>(
+      test_guest_web_contents->GetBrowserPluginGuest());
+  test_guest->WaitForUpdateRectMsg();
+
+  {
+    const string16 expected_title = ASCIIToUTF16("main guest");
+    content::TitleWatcher title_watcher(embedder_web_contents, expected_title);
+
+    rvh->ExecuteJavascriptAndGetValue(string16(), ASCIIToUTF16(
+        StringPrintf("PostMessage('%s, false');", kTesting)));
+
+    // The title will be updated to "main guest" at the last stage of the
+    // process described above.
+    string16 actual_title = title_watcher.WaitAndGetTitle();
+    EXPECT_EQ(expected_title, actual_title);
+  }
+  {
+    content::TitleWatcher ready_watcher(embedder_web_contents,
+                                        ASCIIToUTF16("ready"));
+
+    RenderViewHostImpl* guest_rvh = static_cast<RenderViewHostImpl*>(
+        test_guest_web_contents->GetRenderViewHost());
+    guest_rvh->ExecuteJavascriptAndGetValue(string16(), ASCIIToUTF16(
+        StringPrintf("CreateChildFrame('%s');", test_url.spec().c_str())));
+
+    string16 actual_title = ready_watcher.WaitAndGetTitle();
+    EXPECT_EQ(ASCIIToUTF16("ready"), actual_title);
+
+    content::TitleWatcher iframe_watcher(embedder_web_contents,
+                                        ASCIIToUTF16("iframe"));
+    rvh->ExecuteJavascriptAndGetValue(string16(), ASCIIToUTF16(
+        StringPrintf("PostMessage('%s', true);", kTesting)));
+
+    // The title will be updated to "iframe" at the last stage of the
+    // process described above.
+    actual_title = iframe_watcher.WaitAndGetTitle();
+    EXPECT_EQ(ASCIIToUTF16("iframe"), actual_title);
+  }
+}
 
 }  // namespace content