[DevTools] Support multiple sessions in content/ domain handlers

content/browser/devtools/protocol/page_handler.h

 // 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 CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 12 matching lines @@
 #include "content/public/browser/readback_types.h"
 
 class SkBitmap;
 
 namespace gfx {
 class Image;
 }  // namespace gfx
 
 namespace content {
 
-class DevToolsSession;
+class DevToolsAgentHostImpl;
 class NavigationHandle;
 class PageNavigationThrottle;
 class RenderFrameHostImpl;
 class WebContentsImpl;
 
 namespace protocol {
 
 class PageHandler : public DevToolsDomainHandler,
                     public Page::Backend,
                     public NotificationObserver {
  public:
   PageHandler();
   ~PageHandler() override;
 
-  static PageHandler* FromSession(DevToolsSession* session);
+  static std::vector<PageHandler*> ForAgentHost(DevToolsAgentHostImpl* host);
 
   void Wire(UberDispatcher* dispatcher) override;
   void SetRenderFrameHost(RenderFrameHostImpl* host) override;
   void OnSwapCompositorFrame(cc::CompositorFrameMetadata frame_metadata);
   void OnSynchronousSwapCompositorFrame(
       cc::CompositorFrameMetadata frame_metadata);
   void DidAttachInterstitialPage();
   void DidDetachInterstitialPage();
   bool screencast_enabled() const { return enabled_ && screencast_enabled_; }
 
@@ skipping 90 matching lines @@
   NotificationRegistrar registrar_;
   base::WeakPtrFactory<PageHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PageHandler);
 };
 
 }  // namespace protocol
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_