Add SetImageData api to chrome.clipboard.

extensions/shell/browser/shell_extensions_browser_client.h

Index: extensions/shell/browser/shell_extensions_browser_client.h
diff --git a/extensions/shell/browser/shell_extensions_browser_client.h b/extensions/shell/browser/shell_extensions_browser_client.h
index 4b161f417f5de4fb3d428df1d23507c463e2a698..11e919c4953b523b61dfb117e0e8b8e40d615d33 100644
--- a/extensions/shell/browser/shell_extensions_browser_client.h
+++ b/extensions/shell/browser/shell_extensions_browser_client.h
@@ -44,6 +44,10 @@ class ShellExtensionsBrowserClient : public ExtensionsBrowserClient {
 #if defined(OS_CHROMEOS)
   std::string GetUserIdHashFromContext(
       content::BrowserContext* context) override;
+  void SaveImageDataToClipboard(const std::vector<char>& image_data,
+                                api::clipboard::ImageType type,
+                                const base::Closure& success_callback,
+                                const ErrorCallback& error_callback) override;
 #endif
   bool IsGuestSession(content::BrowserContext* context) const override;
   bool IsExtensionIncognitoEnabled(