[DevTools] Issue zoom from DevToolsWindow instead of browser commands.

chrome/browser/devtools/devtools_embedder_message_dispatcher.cc

 // Copyright 2013 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/devtools/devtools_embedder_message_dispatcher.h"
 
 #include "base/bind.h"
 #include "base/values.h"
 
 namespace {
@@ skipping 216 matching lines @@
                                  base::Unretained(delegate))));
   RegisterHandler("indexPath",
       BindToListParser(base::Bind(&Delegate::IndexPath,
                                   base::Unretained(delegate))));
   RegisterHandler("stopIndexing",
       BindToListParser(base::Bind(&Delegate::StopIndexing,
                                   base::Unretained(delegate))));
   RegisterHandler("searchInPath",
       BindToListParser(base::Bind(&Delegate::SearchInPath,
                                   base::Unretained(delegate))));
+  RegisterHandler("zoomIn",
+      BindToListParser(base::Bind(&Delegate::ZoomIn,
+                                  base::Unretained(delegate))));
+  RegisterHandler("zoomOut",
+      BindToListParser(base::Bind(&Delegate::ZoomOut,
+                                  base::Unretained(delegate))));
+  RegisterHandler("resetZoom",
+      BindToListParser(base::Bind(&Delegate::ResetZoom,
+                                  base::Unretained(delegate))));
 }
 
 DevToolsEmbedderMessageDispatcher::~DevToolsEmbedderMessageDispatcher() {}
 
 std::string DevToolsEmbedderMessageDispatcher::Dispatch(
     const std::string& method, base::ListValue* params) {
   HandlerMap::iterator it = handlers_.find(method);
   if (it == handlers_.end())
     return "Unsupported frontend host method: " + method;
 
   if (!it->second.Run(*params))
     return "Invalid frontend host message parameters: " + method;
   return "";
 }
 
 void DevToolsEmbedderMessageDispatcher::RegisterHandler(
     const std::string& method, const Handler& handler) {
   handlers_[method] = handler;
 }