DevTools: allow storing devtools preferences on the browser side.

content/shell/browser/shell_devtools_frontend.h

Index: content/shell/browser/shell_devtools_frontend.h
diff --git a/content/shell/browser/shell_devtools_frontend.h b/content/shell/browser/shell_devtools_frontend.h
index d6ce91b2ac812744aaf1fbc95f5cacbe4534eb41..15a236e532d1fb411f00c0c21c7a55110d359c2b 100644
--- a/content/shell/browser/shell_devtools_frontend.h
+++ b/content/shell/browser/shell_devtools_frontend.h
@@ -10,6 +10,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/values.h"
 #include "content/public/browser/devtools_agent_host.h"
 #include "content/public/browser/devtools_frontend_host.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -54,6 +55,7 @@ class ShellDevToolsFrontend : public WebContentsObserver,
   void AgentHostClosed(DevToolsAgentHost* agent_host, bool replaced) override;
   void DispatchProtocolMessage(DevToolsAgentHost* agent_host,
                                const std::string& message) override;
+  base::DictionaryValue* preferences() { return &preferences_; }
 
  private:
   // WebContentsObserver overrides
@@ -78,6 +80,7 @@ class ShellDevToolsFrontend : public WebContentsObserver,
   scoped_ptr<DevToolsFrontendHost> frontend_host_;
   using PendingRequestsMap = std::map<const net::URLFetcher*, int>;
   PendingRequestsMap pending_requests_;
+  base::DictionaryValue preferences_;
   base::WeakPtrFactory<ShellDevToolsFrontend> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDevToolsFrontend);