Local NTP: Tell the browser if we start with keycapture enabled

This fixes a problem where both Omnibox and fakebox could have visible
focus at the same time.

Bug: 792850
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Id4801641c1ee192ffef943ecb738abf41fecc348
Reviewed-on: https://chromium-review.googlesource.com/827076Reviewed-by: Chris Pickel <sfiera@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524082}

chrome/browser/resources/local_ntp/local_ntp.js

@@ -656,6 +656,12 @@ function init() {
 
     // Update the fakebox style to match the current key capturing state.
     setFakeboxFocus(searchboxApiHandle.isKeyCaptureEnabled);
+    // Also tell the browser that we're capturing, otherwise it's possible that
+    // both fakebox and Omnibox have visible focus at the same time, see
+    // crbug.com/792850.
+    if (searchboxApiHandle.isKeyCaptureEnabled) {
+      searchboxApiHandle.startCapturingKeyStrokes();
+    }
 
     // Load the Doodle. After the first request completes (getting cached
     // data), issue a second request for fresh Doodle data.