Add DownloadControllerAndroid public interface for android.

chrome/browser/android/chrome_web_contents_delegate_android.h

Index: chrome/browser/android/chrome_web_contents_delegate_android.h
diff --git a/chrome/browser/android/chrome_web_contents_delegate_android.h b/chrome/browser/android/chrome_web_contents_delegate_android.h
index 0e834958864fd3af5b8f60ff58f3b4806958de57..ea6adc19009591adb070b0d141cb6d163be450fa 100644
--- a/chrome/browser/android/chrome_web_contents_delegate_android.h
+++ b/chrome/browser/android/chrome_web_contents_delegate_android.h
@@ -52,6 +52,11 @@ class ChromeWebContentsDelegateAndroid
                                    const gfx::RectF& active_rect) OVERRIDE;
   virtual content::JavaScriptDialogCreator*
   GetJavaScriptDialogCreator() OVERRIDE;
+  virtual bool CanDownload(content::RenderViewHost* source,
+                           int request_id,
+                           const std::string& request_method) OVERRIDE;
+  virtual void OnStartDownload(content::WebContents* source,
+                               content::DownloadItem* download) OVERRIDE;
 
  private:
   // NotificationObserver implementation.