Page zoom improvements

content/browser/host_zoom_map.cc

 // Copyright (c) 2011 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 <cmath>
 
 #include "content/browser/host_zoom_map.h"
 
 #include "base/string_piece.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
+#include "content/public/common/page_zoom.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/net_util.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 
 using content::BrowserThread;
 using WebKit::WebView;
 
 HostZoomMap::HostZoomMap()
     : default_zoom_level_(0.0),
       original_(this) {
@@ skipping 22 matching lines @@
   base::AutoLock auto_lock(lock_);
   HostZoomLevels::const_iterator i(host_zoom_levels_.find(host));
   return (i == host_zoom_levels_.end()) ? default_zoom_level_ : i->second;
 }
 
 void HostZoomMap::SetZoomLevel(std::string host, double level) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   {
     base::AutoLock auto_lock(lock_);
-    if (level == default_zoom_level_)
+
+    if (content::ZoomValuesEqual(level, default_zoom_level_))
       host_zoom_levels_.erase(host);
     else
       host_zoom_levels_[host] = level;
   }
 
   content::NotificationService::current()->Notify(
       content::NOTIFICATION_ZOOM_LEVEL_CHANGED,
       content::Source<HostZoomMap>(this),
       content::Details<const std::string>(&host));
 }
@@ skipping 69 matching lines @@
       }
       break;
     }
     default:
       NOTREACHED() << "Unexpected preference observed.";
   }
 }
 
 HostZoomMap::~HostZoomMap() {
 }