app_shell: Add audio and video capture support

extensions/shell/browser/shell_app_window.h

Index: extensions/shell/browser/shell_app_window.h
diff --git a/extensions/shell/browser/shell_app_window.h b/extensions/shell/browser/shell_app_window.h
index d85f4f00d7e6557e4397a315d8f53e3ced591e4f..071e5bd84472d6b627e50c00dffbcb173885cd2e 100644
--- a/extensions/shell/browser/shell_app_window.h
+++ b/extensions/shell/browser/shell_app_window.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/browser/extension_function_dispatcher.h"
 
@@ -29,10 +30,12 @@ class Size;
 namespace extensions {
 
 class ExtensionFunctionDispatcher;
+class ShellWebContentsDelegate;
 
 // A simplified app window created by chrome.app.window.create(). Manages the
 // primary web contents for the app.
-class ShellAppWindow : public content::WebContentsObserver,
+class ShellAppWindow : public content::WebContentsDelegate,
+                       public content::WebContentsObserver,
                        public ExtensionFunctionDispatcher::Delegate {
  public:
   ShellAppWindow();
@@ -51,10 +54,16 @@ class ShellAppWindow : public content::WebContentsObserver,
   // Returns the routing ID of the render view host of |web_contents_|.
   int GetRenderViewRoutingID();
 
-  // content::WebContentsObserver implementation
+  // content::WebContentsDelegate overrides:
+  virtual void RequestMediaAccessPermission(
+      content::WebContents* web_contents,
+      const content::MediaStreamRequest& request,
+      const content::MediaResponseCallback& callback) OVERRIDE;
+
+  // content::WebContentsObserver overrides:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
-  // ExtensionFunctionDispatcher::Delegate implementation
+  // ExtensionFunctionDispatcher::Delegate overrides:
   virtual content::WebContents* GetAssociatedWebContents() const OVERRIDE;
 
  private: