[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/page_handler.cc

 // 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 "content/browser/devtools/protocol/page_handler.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/threading/worker_pool.h"
+#include "content/browser/devtools/devtools_session.h"
 #include "content/browser/devtools/page_navigation_throttle.h"
 #include "content/browser/devtools/protocol/color_picker.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/javascript_dialog_manager.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 56 matching lines @@
   base::Base64Encode(
       base::StringPiece(reinterpret_cast<char*>(&data[0]), data.size()),
       &base_64_data);
 
   return base_64_data;
 }
 
 }  // namespace
 
 PageHandler::PageHandler()
-    : enabled_(false),
+    : DevToolsDomainHandler(Page::Metainfo::domainName),
+      enabled_(false),
       screencast_enabled_(false),
       screencast_quality_(kDefaultScreenshotQuality),
       screencast_max_width_(-1),
       screencast_max_height_(-1),
       capture_every_nth_frame_(1),
       capture_retry_count_(0),
       has_compositor_frame_metadata_(false),
       session_id_(0),
       frame_counter_(0),
       frames_in_flight_(0),
       color_picker_(new ColorPicker(
           base::Bind(&PageHandler::OnColorPicked, base::Unretained(this)))),
       navigation_throttle_enabled_(false),
       next_navigation_id_(0),
       host_(nullptr),
       weak_factory_(this) {}
 
 PageHandler::~PageHandler() {
 }
 
+// static
+PageHandler* PageHandler::FromSession(DevToolsSession* session) {
+  return static_cast<PageHandler*>(
+      session->GetHandlerByName(Page::Metainfo::domainName));
+}
+
 void PageHandler::SetRenderFrameHost(RenderFrameHostImpl* host) {
   if (host_ == host)
     return;
 
   RenderWidgetHostImpl* widget_host =
       host_ ? host_->GetRenderWidgetHost() : nullptr;
   if (widget_host) {
     registrar_.Remove(
         this,
         content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
@@ skipping 450 matching lines @@
 Response PageHandler::StopLoading() {
   WebContentsImpl* web_contents = GetWebContents();
   if (!web_contents)
     return Response::InternalError();
   web_contents->Stop();
   return Response::OK();
 }
 
 }  // namespace protocol
 }  // namespace content