[DevTools] Rework DevToolsSession interaction with domain handlers.

content/browser/devtools/protocol/input_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_INPUT_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_INPUT_HANDLER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "content/browser/devtools/protocol/devtools_domain_handler.h"
 #include "content/browser/devtools/protocol/input.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
 #include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
 #include "ui/gfx/geometry/size_f.h"
 
 namespace cc {
 class CompositorFrameMetadata;
 }
 
 namespace content {
 
+class DevToolsSession;
 class RenderFrameHostImpl;
 
 namespace protocol {
 
-class InputHandler : public Input::Backend {
+class InputHandler : public DevToolsDomainHandler,
+                     public Input::Backend {
  public:
   InputHandler();
   ~InputHandler() override;
 
-  void Wire(UberDispatcher*);
-  void SetRenderFrameHost(RenderFrameHostImpl* host);
+  static InputHandler* FromSession(DevToolsSession* session);
+
+  void Wire(UberDispatcher* dispatcher) override;
+  void SetRenderFrameHost(RenderFrameHostImpl* host) override;
   void OnSwapCompositorFrame(const cc::CompositorFrameMetadata& frame_metadata);
   Response Disable() override;
 
   Response DispatchKeyEvent(const std::string& type,
                             Maybe<int> modifiers,
                             Maybe<double> timestamp,
                             Maybe<std::string> text,
                             Maybe<std::string> unmodified_text,
                             Maybe<std::string> key_identifier,
                             Maybe<std::string> code,
@@ skipping 77 matching lines @@
   int last_id_;
   base::WeakPtrFactory<InputHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InputHandler);
 };
 
 }  // namespace protocol
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_INPUT_HANDLER_H_