Adding MimeHandlerView.

This GuestView type would be used to render out of process pdf through extension.
This introduces BrowserPluginDelegate in content/renderer,
because we need a way to create a MimeHandlerView guest (extensions/ concept)
from BrowserPlugin (content/ concept).

MimeHandlerView is behind --enable-mime-handler-view flag.

BUG=303491
Test=Apply http://crrev.com/392813003/ on top of this CL,
Launch chrome with --out-of-process-pdf flag and --enable-mime-handler-view flag
Navigate to a PDF
Check PDF is served using BrowserPlugin, probably easier to see process associated with the BrowserPlugin from Chrome's task manager.

Review URL: https://codereview.chromium.org/376033002

Cr-Commit-Position: refs/heads/master@{#293613}

4 files changed, 119 insertions, 0 deletions

diff --git a/chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.cc b/chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.cc
new file mode 100644
index 0000000..fe5fd0c
--- /dev/null
+++ b/chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.cc
@@ -0,0 +1,68 @@
+// Copyright 2014 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 "chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.h"
+
+#include "content/public/renderer/browser_plugin_delegate.h"
+#include "content/public/renderer/render_frame.h"
+#include "extensions/common/extension_messages.h"
+
+ChromeBrowserPluginDelegate::ChromeBrowserPluginDelegate(
+    content::RenderFrame* render_frame,
+    const std::string& mime_type)
+    : content::BrowserPluginDelegate(render_frame, mime_type),
+      content::RenderFrameObserver(render_frame),
+      mime_type_(mime_type),
+      // TODO(lazyboy): Use browser_plugin::kInstanceIDNone.
+      element_instance_id_(0) {
+}
+
+ChromeBrowserPluginDelegate::~ChromeBrowserPluginDelegate() {
+}
+
+void ChromeBrowserPluginDelegate::SetElementInstanceID(
+    int element_instance_id) {
+  element_instance_id_ = element_instance_id;
+}
+
+void ChromeBrowserPluginDelegate::DidFinishLoading() {
+  DCHECK_NE(element_instance_id_, 0);
+  render_frame()->Send(new ExtensionHostMsg_CreateMimeHandlerViewGuest(
+      routing_id(), html_string_, mime_type_, element_instance_id_));
+}
+
+void ChromeBrowserPluginDelegate::DidReceiveData(const char* data,
+                                                 int data_length) {
+  std::string value(data, data_length);
+  html_string_ += value;
+}
+
+bool ChromeBrowserPluginDelegate::OnMessageReceived(
+    const IPC::Message& message) {
+  if (message.type() != ExtensionMsg_CreateMimeHandlerViewGuestACK::ID)
+    return false;
+
+  DCHECK_NE(element_instance_id_, 0);
+  int element_instance_id = 0;
+  PickleIterator iter(message);
+  bool success = iter.ReadInt(&element_instance_id);
+  DCHECK(success);
+  if (element_instance_id != element_instance_id_)
+    return false;
+
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(ChromeBrowserPluginDelegate, message)
+    IPC_MESSAGE_HANDLER(ExtensionMsg_CreateMimeHandlerViewGuestACK,
+                        OnCreateMimeHandlerViewGuestACK)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void ChromeBrowserPluginDelegate::OnCreateMimeHandlerViewGuestACK(
+    int element_instance_id) {
+  DCHECK_NE(element_instance_id_, 0);
+  DCHECK_EQ(element_instance_id_, element_instance_id);
+  render_frame()->AttachGuest(element_instance_id);
+}
diff --git a/chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.h b/chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.h
new file mode 100644
index 0000000..fa08dbd
--- /dev/null
+++ b/chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.h
@@ -0,0 +1,39 @@
+// Copyright 2014 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.
+
+#ifndef CHROME_RENDERER_BROWSER_PLUGIN_CHROME_BROWSER_PLUGIN_DELEGATE_H_
+#define CHROME_RENDERER_BROWSER_PLUGIN_CHROME_BROWSER_PLUGIN_DELEGATE_H_
+
+#include "content/public/renderer/browser_plugin_delegate.h"
+
+#include "content/public/renderer/render_frame_observer.h"
+#include "ipc/ipc_listener.h"
+
+// TODO(lazyboy): This should live under /extensions.
+class ChromeBrowserPluginDelegate : public content::BrowserPluginDelegate,
+                                    public content::RenderFrameObserver {
+ public:
+  ChromeBrowserPluginDelegate(content::RenderFrame* render_frame,
+                              const std::string& mime_type);
+  virtual ~ChromeBrowserPluginDelegate();
+
+  // BrowserPluginDelegate implementation.
+  virtual void SetElementInstanceID(int element_instance_id) OVERRIDE;
+  virtual void DidFinishLoading() OVERRIDE;
+  virtual void DidReceiveData(const char* data, int data_length) OVERRIDE;
+
+  // RenderFrameObserver override.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ private:
+  void OnCreateMimeHandlerViewGuestACK(int browser_plugin_delegate);
+
+  const std::string mime_type_;
+  int element_instance_id_;
+  std::string html_string_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeBrowserPluginDelegate);
+};
+
+#endif  // CHROME_RENDERER_BROWSER_PLUGIN_CHROME_BROWSER_PLUGIN_DELEGATE_H_
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 079eeb5..367426a 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -30,6 +30,7 @@
 #include "chrome/grit/locale_settings.h"
 #include "chrome/grit/renderer_resources.h"
 #include "chrome/renderer/benchmarking_extension.h"
+#include "chrome/renderer/browser_plugin/chrome_browser_plugin_delegate.h"
 #include "chrome/renderer/chrome_render_frame_observer.h"
 #include "chrome/renderer/chrome_render_process_observer.h"
 #include "chrome/renderer/chrome_render_view_observer.h"
@@ -1524,3 +1525,10 @@ bool ChromeContentRendererClient::IsPluginAllowedToUseVideoDecodeAPI(
   return false;
 #endif
 }
+
+content::BrowserPluginDelegate*
+ChromeContentRendererClient::CreateBrowserPluginDelegate(
+    content::RenderFrame* render_frame,
+    const std::string& mime_type) {
+  return new ChromeBrowserPluginDelegate(render_frame, mime_type);
+}
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 7b06cbc..c8792c1 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -31,6 +31,7 @@ class SpellCheckProvider;
 struct ChromeViewHostMsg_GetPluginInfo_Output;
 
 namespace content {
+class BrowserPluginDelegate;
 struct WebPluginInfo;
 }
 
@@ -139,6 +140,9 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
   virtual bool IsPluginAllowedToUseDevChannelAPIs() OVERRIDE;
   virtual bool IsPluginAllowedToUseCompositorAPI(const GURL& url) OVERRIDE;
   virtual bool IsPluginAllowedToUseVideoDecodeAPI(const GURL& url) OVERRIDE;
+  virtual content::BrowserPluginDelegate* CreateBrowserPluginDelegate(
+      content::RenderFrame* render_frame,
+      const std::string& mime_type) OVERRIDE;
 
   // Takes ownership.
   void SetExtensionDispatcherForTest(