Add a simple UMA for counting web intents dispatches.

chrome/browser/ui/browser.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/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // OS_WIN
@@ skipping 3983 matching lines @@
   RegisterIntentHandlerHelper(tab, action, type, href, title, disposition);
 #endif
 }
 
 void Browser::WebIntentDispatch(
     WebContents* tab, content::WebIntentsDispatcher* intents_dispatcher) {
 #if defined(ENABLE_WEB_INTENTS)
   if (!web_intents::IsWebIntentsEnabled())
     return;
 
+  UMA_HISTOGRAM_COUNTS("WebIntents.Dispatch", 1);

[James Hawkins, 2012/05/02 20:03:00]

Are you familiar with all the other requirements you need to fulfill to add a
histogram?

[Greg Billock, 2012/05/02 20:11:54]

No. I looked for details, but didn't find them, so I figured this way I'd learn.
:-)

On 2012/05/02 20:03:00, James Hawkins wrote:

+
   TabContentsWrapper* tcw =
       TabContentsWrapper::GetCurrentWrapperForContents(tab);
   tcw->web_intent_picker_controller()->SetIntentsDispatcher(intents_dispatcher);
   tcw->web_intent_picker_controller()->ShowDialog(
       this,
       intents_dispatcher->GetIntent().action,
       intents_dispatcher->GetIntent().type);
 #endif  // defined(ENABLE_WEB_INTENTS)
 }
 
@@ skipping 1491 matching lines @@
   if (contents && !allow_js_access) {
     contents->web_contents()->GetController().LoadURL(
         target_url,
         content::Referrer(),
         content::PAGE_TRANSITION_LINK,
         std::string());  // No extra headers.
   }
 
   return contents != NULL;
 }