[DevTools] Filter any messages from previous sessions in DevToolsAgentHostImpl

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 "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 48 matching lines @@
                   const std::string* script_preprocessor = NULL);
 
   Response Navigate(const std::string& url, FrameId* frame_id);
 
   using NavigationEntries = std::vector<scoped_refptr<NavigationEntry>>;
   Response GetNavigationHistory(int* current_index,
                                 NavigationEntries* entries);
 
   Response NavigateToHistoryEntry(int entry_id);
 
-  Response CaptureScreenshot(DevToolsCommandId command_id);
+  Response CaptureScreenshot(int session_id, DevToolsCommandId command_id);
 
   Response CanScreencast(bool* result);
   Response StartScreencast(const std::string* format,
                            const int* quality,
                            const int* max_width,
                            const int* max_height);
   Response StopScreencast();
   Response ScreencastFrameAck(int frame_number);
 
   Response HandleJavaScriptDialog(bool accept, const std::string* prompt_text);
 
   Response QueryUsageAndQuota(DevToolsCommandId command_id,
                               const std::string& security_origin);
 
   Response SetColorPickerEnabled(bool enabled);
 
  private:
   WebContentsImpl* GetWebContents();
   void NotifyScreencastVisibility(bool visible);
   void InnerSwapCompositorFrame();
   void ScreencastFrameCaptured(const cc::CompositorFrameMetadata& metadata,
                                const SkBitmap& bitmap,
                                ReadbackResponse response);
   void ScreencastFrameEncoded(const cc::CompositorFrameMetadata& metadata,
                               const base::Time& timestamp,
                               const std::string& data);
 
-  void ScreenshotCaptured(
-      DevToolsCommandId command_id,
-      const unsigned char* png_data,
-      size_t png_size);
+  void ScreenshotCaptured(int session_id,
+                          DevToolsCommandId command_id,
+                          const unsigned char* png_data,
+                          size_t png_size);
 
   void OnColorPicked(int r, int g, int b, int a);
 
   // NotificationObserver overrides.
   void Observe(int type,
                const NotificationSource& source,
                const NotificationDetails& details) override;
 
   bool enabled_;
 
@@ skipping 19 matching lines @@
   base::WeakPtrFactory<PageHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PageHandler);
 };
 
 }  // namespace page
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_PAGE_HANDLER_H_