Browser Plugin: More robust recovery from guest crash

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/command_line.h"
 #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"
@@ skipping 657 matching lines @@
 
   RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
       test_embedder()->web_contents()->GetRenderViewHost());
   ExecuteSyncJSFunction(rvh, ASCIIToUTF16(
       "document.getElementById('plugin').terminate()"));
 
   // Expect the guest to crash.
   test_guest()->WaitForCrashed();
 }
 
+// This test verifies that the guest is responsive after crashing and going back
+// to a previous navigation entry.
+IN_PROC_BROWSER_TEST_F(BrowserPluginHostTest, BackAfterTerminateGuest) {
+  const char* kEmbedderURL = "files/browser_plugin_embedder.html";
+  StartBrowserPluginTest(
+      kEmbedderURL, GetHTMLForGuestWithTitle("P1"), true, "");
+  RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
+      test_embedder()->web_contents()->GetRenderViewHost());
+
+  // Navigate to P2 and verify that the navigation occurred.
+  {
+    const string16 expected_title = ASCIIToUTF16("P2");
+    content::TitleWatcher title_watcher(test_guest()->web_contents(),
+                                        expected_title);
+
+    ExecuteSyncJSFunction(rvh, ASCIIToUTF16(StringPrintf("SetSrc('%s');",
+        GetHTMLForGuestWithTitle("P2").c_str())));
+
+    string16 actual_title = title_watcher.WaitAndGetTitle();
+    EXPECT_EQ(expected_title, actual_title);
+  }
+  // Kill the guest.
+  ExecuteSyncJSFunction(rvh,
+      ASCIIToUTF16("document.getElementById('plugin').terminate()"));
+
+  // Expect the guest to report that it crashed.
+  test_guest()->WaitForCrashed();
+  // Go back and verify that we're back at P1.
+  {
+    const string16 expected_title = ASCIIToUTF16("P1");
+    content::TitleWatcher title_watcher(test_guest()->web_contents(),
+                                        expected_title);
+
+    ExecuteSyncJSFunction(rvh, ASCIIToUTF16("Back();"));
+
+    string16 actual_title = title_watcher.WaitAndGetTitle();
+    EXPECT_EQ(expected_title, actual_title);
+  }
+  // Send an input event and verify that the guest receives the input.
+  SimulateMouseClick(test_embedder()->web_contents());
+  test_guest()->WaitForInput();
+}
+
 IN_PROC_BROWSER_TEST_F(BrowserPluginHostTest, LoadStart) {
   const char kEmbedderURL[] = "files/browser_plugin_embedder.html";
   StartBrowserPluginTest(kEmbedderURL, "about:blank", true, "");
 
   const string16 expected_title = ASCIIToUTF16(kHTMLForGuest);
   content::TitleWatcher title_watcher(test_embedder()->web_contents(),
                                       expected_title);
   // Renavigate the guest to |kHTMLForGuest|.
   RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
       test_embedder()->web_contents()->GetRenderViewHost());
@@ skipping 96 matching lines @@
       gfx::Point(start_x, start_y), WebKit::WebDragOperationEvery, 0);
   rvh->DragTargetDragOver(gfx::Point(end_x, end_y), gfx::Point(end_x, end_y),
       WebKit::WebDragOperationEvery, 0);
   rvh->DragTargetDrop(gfx::Point(end_x, end_y), gfx::Point(end_x, end_y), 0);
 
   string16 actual_title = title_watcher.WaitAndGetTitle();
   EXPECT_EQ(expected_title, actual_title);
 }
 
 }  // namespace content