Check temporary zoom status when sending zoom level in navigation.

content/public/browser/host_zoom_map.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
 #define CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 119 matching lines @@
   // This should only be called on the UI thread.
   virtual void SetZoomLevelForHostAndScheme(const std::string& scheme,
                                             const std::string& host,
                                             double level) = 0;
 
   // Returns whether the view manages its zoom level independently of other
   // views displaying content from the same host.
   virtual bool UsesTemporaryZoomLevel(int render_process_id,
                                       int render_view_id) const = 0;
 
+  // Returns the temporary zoom level that's only valid for the lifetime of
+  // the given WebContents (i.e. isn't saved and doesn't affect other
+  // WebContentses) if it exists, the default zoom level otherwise.
+  //
+  // This may be called on any thread.
+  virtual double GetTemporaryZoomLevel(int render_process_id,

[Charlie Reis, 2015/02/11 18:34:31]

From the Content API guidelines:
http://www.chromium.org/developers/content-module/content-api

"only expose methods in the public API that embedders need. If a method is only
used by other code in content, it belongs in foo_impl.h and not foo.h."

[wjmaclean, 2015/02/11 20:29:34]

Done.

+                                       int render_view_id) const = 0;

[Charlie Reis, 2015/02/11 18:34:31]

From the Content API guidelines:
http://www.chromium.org/developers/content-module/content-api

"don't add the const identifier to interfaces. For interfaces implemented by the
embedder, we can't make assumptions about what the embedder needs to implement
it. For interfaces implemented by content, the implementation details doesn't
have to be exposed."

[wjmaclean, 2015/02/11 20:29:34]

Done.

+
   // Sets the temporary zoom level that's only valid for the lifetime of this
   // WebContents.
   //
   // This should only be called on the UI thread.
   virtual void SetTemporaryZoomLevel(int render_process_id,
                                      int render_view_id,
                                      double level) = 0;
 
   // Clears the temporary zoom level stored for this WebContents.
   //
@@ skipping 12 matching lines @@
   virtual scoped_ptr<Subscription> AddZoomLevelChangedCallback(
       const ZoomLevelChangedCallback& callback) = 0;
 
  protected:
   virtual ~HostZoomMap() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_