Add "clear" to about://instant.

chrome/browser/ui/webui/instant_ui.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/webui/instant_ui.h"
 
 #include "base/bind.h"
 #include "base/prefs/pref_service.h"
 #include "base/stringprintf.h"
 #include "base/time.h"
@@ skipping 40 matching lines @@
   InstantUIMessageHandler();
   virtual ~InstantUIMessageHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
  private:
   void GetPreferenceValue(const base::ListValue* args);
   void SetPreferenceValue(const base::ListValue* args);
   void GetDebugInfo(const base::ListValue* value);
+  void ClearDebugInfo(const base::ListValue* value);
 
   DISALLOW_COPY_AND_ASSIGN(InstantUIMessageHandler);
 };
 
 InstantUIMessageHandler::InstantUIMessageHandler() {}
 
 InstantUIMessageHandler::~InstantUIMessageHandler() {}
 
 void InstantUIMessageHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(
       "getPreferenceValue",
       base::Bind(&InstantUIMessageHandler::GetPreferenceValue,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "setPreferenceValue",
       base::Bind(&InstantUIMessageHandler::SetPreferenceValue,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "getDebugInfo",
       base::Bind(&InstantUIMessageHandler::GetDebugInfo,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      "clearDebugInfo",
+      base::Bind(&InstantUIMessageHandler::ClearDebugInfo,
+                 base::Unretained(this)));
 }
 
 void InstantUIMessageHandler::GetPreferenceValue(const base::ListValue* args) {
   std::string pref_name;
   if (!args->GetString(0, &pref_name)) return;
 
   base::StringValue pref_name_value(pref_name);
   if (pref_name == prefs::kInstantUIZeroSuggestUrlPrefix) {
     PrefService* prefs = Profile::FromWebUI(web_ui())->GetPrefs();
     base::StringValue arg(prefs->GetString(pref_name.c_str()));
@@ skipping 37 matching lines @@
     entry->SetString("time", FormatTime(it->first));
     entry->SetString("text", it->second);
     entries->Append(entry);
   }
   data.Set("entries", entries);
 
   web_ui()->CallJavascriptFunction("instantConfig.getDebugInfoResult", data);
 #endif
 }
 
+void InstantUIMessageHandler::ClearDebugInfo(const base::ListValue* args) {
+#if !defined(OS_ANDROID)
+  if (!web_ui()->GetWebContents())
+    return;
+  Browser* browser = chrome::FindBrowserWithWebContents(
+      web_ui()->GetWebContents());
+  if (!browser || !browser->instant_controller())
+    return;
+
+  browser->instant_controller()->instant()->ClearDebugEvents();
+#endif
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // InstantUI
 
 InstantUI::InstantUI(content::WebUI* web_ui) : WebUIController(web_ui) {
   web_ui->AddMessageHandler(new InstantUIMessageHandler());
 
   // Set up the chrome://instant/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, CreateInstantHTMLSource());
 }
 
 // static
 void InstantUI::RegisterUserPrefs(PrefRegistrySyncable* registry) {
   registry->RegisterStringPref(prefs::kInstantUIZeroSuggestUrlPrefix, "",
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 }