<webview>: Support zoom in WebUI

chrome/browser/chrome_page_zoom.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/chrome_page_zoom.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/prefs/pref_service.h"
@@ skipping 47 matching lines @@
 
 std::vector<double> PresetZoomFactors(double custom_factor) {
   return PresetZoomValues(PAGE_ZOOM_VALUE_TYPE_FACTOR, custom_factor);
 }
 
 std::vector<double> PresetZoomLevels(double custom_level) {
   return PresetZoomValues(PAGE_ZOOM_VALUE_TYPE_LEVEL, custom_level);
 }
 
 void Zoom(content::WebContents* web_contents, content::PageZoom zoom) {
-  content::RenderViewHost* host = web_contents->GetRenderViewHost();
   double current_zoom_level = web_contents->GetZoomLevel();
   double default_zoom_level =
       Profile::FromBrowserContext(web_contents->GetBrowserContext())->
           GetPrefs()->GetDouble(prefs::kDefaultZoomLevel);
 
   if (zoom == content::PAGE_ZOOM_RESET) {
-    host->SetZoomLevel(default_zoom_level);
+    web_contents->SetZoomLevel(default_zoom_level);
     content::RecordAction(UserMetricsAction("ZoomNormal"));
     return;
   }
 
   // Generate a vector of zoom levels from an array of known presets along with
   // the default level added if necessary.
   std::vector<double> zoom_levels = PresetZoomLevels(default_zoom_level);
 
   if (zoom == content::PAGE_ZOOM_OUT) {
     // Iterate through the zoom levels in reverse order to find the next
     // lower level based on the current zoom level for this page.
     for (std::vector<double>::reverse_iterator i = zoom_levels.rbegin();
          i != zoom_levels.rend(); ++i) {
       double zoom_level = *i;
       if (content::ZoomValuesEqual(zoom_level, current_zoom_level))
         continue;
       if (zoom_level < current_zoom_level) {
-        host->SetZoomLevel(zoom_level);
+        web_contents->SetZoomLevel(zoom_level);
         content::RecordAction(UserMetricsAction("ZoomMinus"));
         return;
       }
       content::RecordAction(UserMetricsAction("ZoomMinus_AtMinimum"));
     }
   } else {
     // Iterate through the zoom levels in normal order to find the next
     // higher level based on the current zoom level for this page.
     for (std::vector<double>::const_iterator i = zoom_levels.begin();
          i != zoom_levels.end(); ++i) {
       double zoom_level = *i;
       if (content::ZoomValuesEqual(zoom_level, current_zoom_level))
         continue;
       if (zoom_level > current_zoom_level) {
-        host->SetZoomLevel(zoom_level);
+        web_contents->SetZoomLevel(zoom_level);
         content::RecordAction(UserMetricsAction("ZoomPlus"));
         return;
       }
     }
     content::RecordAction(UserMetricsAction("ZoomPlus_AtMaximum"));
   }
 }
 
 }  // namespace chrome_page_zoom