Add GetWebContents to ShellDelegate.

ash/common/shell_delegate.h

Index: ash/common/shell_delegate.h
diff --git a/ash/common/shell_delegate.h b/ash/common/shell_delegate.h
index f584cf75cf51036bb3b4d3999225fadb71aecb60..6cb23ed5ea77b77b36a712b03d8cc5e3abbfbc2a 100644
--- a/ash/common/shell_delegate.h
+++ b/ash/common/shell_delegate.h
@@ -14,6 +14,10 @@
 
 class GURL;
 
+namespace content {
+class WebContents;
+}
+
 namespace gfx {
 class Image;
 }
@@ -83,7 +87,7 @@ class ASH_EXPORT ShellDelegate {
   // Invoked when the user uses Ctrl-Shift-Q to close chrome.
   virtual void Exit() = 0;
 
-  // Create a shell-specific keyboard::KeyboardUI
+  // Creates a shell-specific keyboard::KeyboardUI
   virtual keyboard::KeyboardUI* CreateKeyboardUI() = 0;
 
   // Opens the |url| in a new browser tab.
@@ -114,7 +118,7 @@ class ASH_EXPORT ShellDelegate {
   // Creates a GPU support object. Shell takes ownership of the object.
   virtual GPUSupport* CreateGPUSupport() = 0;
 
-  // Get the product name.
+  // Gets the product name.
   virtual base::string16 GetProductName() const = 0;
 
   virtual void OpenKeyboardShortcutHelpPage() const {}
@@ -136,6 +140,9 @@ class ASH_EXPORT ShellDelegate {
 
   // Toggles the status of touchpad between enabled and disabled.
   virtual void ToggleTouchpad() {}
+
+  // Gets the WebContents.
+  virtual content::WebContents* GetWebContents() = 0;
 };
 
 }  // namespace ash