Use blocking worker pool for sync file operations in Pepper.

content/browser/web_contents/web_contents_impl.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 "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 2324 matching lines @@
 void WebContentsImpl::OnSetSelectedColorInColorChooser(int color_chooser_id,
                                                        SkColor color) {
   if (color_chooser_ &&
       color_chooser_id == color_chooser_->identifier())
     color_chooser_->SetSelectedColor(color);
 }
 
 void WebContentsImpl::OnPepperPluginHung(int plugin_child_id,
                                          const FilePath& path,
                                          bool is_hung) {
+  UMA_HISTOGRAM_COUNTS("Pepper.PluginHung", 1);
+
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     PluginHungStatusChanged(plugin_child_id, path, is_hung));
 }
 
 // This exists for render views that don't have a WebUI, but do have WebUI
 // bindings enabled.
 void WebContentsImpl::OnWebUISend(const GURL& source_url,
                                   const std::string& name,
                                   const base::ListValue& args) {
   if (delegate_)
@@ skipping 1043 matching lines @@
   }
 }
 
 content::BrowserPluginGuest* WebContentsImpl::GetBrowserPluginGuest() {
   return browser_plugin_guest_.get();
 }
 
 content::BrowserPluginEmbedder* WebContentsImpl::GetBrowserPluginEmbedder() {
   return browser_plugin_embedder_.get();
 }