Forward MIME types to BrowserPlugin when a viewer is specified.

chrome/browser/extensions/api/streams_private/streams_private_api.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 CHROME_BROWSER_EXTENSIONS_API_STREAMS_PRIVATE_STREAMS_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_STREAMS_PRIVATE_STREAMS_PRIVATE_API_H_
 
 #include <map>
 #include <string>
 
@@ skipping 12 matching lines @@
 
 class StreamsPrivateAPI : public BrowserContextKeyedAPI,
                           public ExtensionRegistryObserver {
  public:
   // Convenience method to get the StreamsPrivateAPI for a BrowserContext.
   static StreamsPrivateAPI* Get(content::BrowserContext* context);
 
   explicit StreamsPrivateAPI(content::BrowserContext* context);
   virtual ~StreamsPrivateAPI();
 
+  // Send the onExecuteMimeTypeHandler event to |extension_id|.
+  // |web_contents| is used to determine the tabId where the document is being
+  // opened. The data for the document will be readable from |stream|, and
+  // should be |expected_content_size| bytes long. If the viewer is already
+  // being opened in a BrowserPlugin, |view_id| will be the ID sent to the
+  // viewer.

[not at google - send to devlin, 2014/04/30 15:42:43]

the implementation implies that |web_contents| is ignored with |view_id| is
non-empty. Perhaps it's worth mentioning that (in a non-implementation-detaily
way) like

If the viewer is being opened in a BrowserPlugin, specify a non-empty |view_id|
of the plugin. This takes precedence over the tab ID.

[Zachary Kuznia, 2014/05/01 00:38:22]

Updated the language for view_id.

   void ExecuteMimeTypeHandler(const std::string& extension_id,
                               const content::WebContents* web_contents,
                               scoped_ptr<content::StreamHandle> stream,
+                              const std::string& view_id,
                               int64 expected_content_size);
 
   // BrowserContextKeyedAPI implementation.
   static BrowserContextKeyedAPIFactory<StreamsPrivateAPI>* GetFactoryInstance();
 
  private:
   friend class BrowserContextKeyedAPIFactory<StreamsPrivateAPI>;
   typedef std::map<std::string,
                    std::map<GURL,
                             linked_ptr<content::StreamHandle> > > StreamMap;
@@ skipping 16 matching lines @@
   base::WeakPtrFactory<StreamsPrivateAPI> weak_ptr_factory_;
 
   // Listen to extension unloaded notifications.
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_STREAMS_PRIVATE_STREAMS_PRIVATE_API_H_