Chromecast: adds scheme for local file support in Android.

R=byungchul@chromium.org,lcwu@chromium.org
BUG=332744

Review URL: https://codereview.chromium.org/605033003

Cr-Commit-Position: refs/heads/master@{#296967}

chromecast/shell/browser/cast_content_browser_client.cc

@@ -68,6 +68,9 @@ bool CastContentBrowserClient::IsHandledURL(const GURL& url) {
       content::kChromeUIScheme,
       content::kChromeDevToolsScheme,
       url::kDataScheme,
+#if defined(OS_ANDROID)
+      url::kFileScheme,
+#endif  // defined(OS_ANDROID)
   };
 
   const std::string& scheme = url.scheme();