Chromecast: always disable "shrinks viewport content to fit."

The setting is enabled by default for Android builds, but not
practical for Chromecast on Android.

R=byungchul@chromium.org,lcwu@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/606453003

Cr-Commit-Position: refs/heads/master@{#296600}

chromecast/chromecast.gyp

@@ -208,6 +208,7 @@
         '../content/content.gyp:content',
         '../content/content.gyp:content_app_browser',
         '../skia/skia.gyp:skia',
+        '../third_party/WebKit/public/blink.gyp:blink',
         '../third_party/widevine/cdm/widevine_cdm.gyp:widevine_cdm_version_h',
       ],
       'sources': [

chromecast/shell/renderer/cast_content_renderer_client.cc

@@ -13,6 +13,7 @@
 #include "content/public/renderer/render_view.h"
 #include "crypto/nss_util.h"
 #include "third_party/WebKit/public/platform/WebColor.h"
+#include "third_party/WebKit/public/web/WebSettings.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 namespace chromecast {
@@ -42,6 +43,7 @@ void CastContentRendererClient::RenderViewCreated(
   blink::WebView* webview = render_view->GetWebView();
   if (webview) {
     webview->setBaseBackgroundColor(kColorBlack);
+    webview->settings()->setShrinksViewportContentToFit(false);
   }
 }