Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/instant/instant_controller.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 112 matching lines @@
 
   // Invoked by the page when its support for the Instant API is determined.
   void InstantSupportDetermined(const content::WebContents* contents,
                                 bool supports_instant);
 
   // Invoked by InstantLoader to request that the preview be shown.
   void ShowInstantPreview(InstantShownReason reason,
                           int height,
                           InstantSizeUnits units);
 
+  // Invoked by InstantLoader to request the browser to start capturing user key
+  // strokes.
+  void StartCapturingKeyStrokes();
+
   // Invoked by InstantLoader when it has swapped a different WebContents into
   // the preview, usually because a prerendered page was navigated to.
   void SwappedWebContents();
 
   // Invoked by InstantLoader when the preview gains focus, usually due to the
   // user clicking on it.
   void InstantLoaderContentsFocused();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(InstantTest, OmniboxFocusLoadsInstant);
@@ skipping 128 matching lines @@
 
   // Whether to allow the preview to show search suggestions. In general, the
   // preview is allowed to show search suggestions whenever |search_mode_| is
   // MODE_SEARCH_SUGGESTIONS, except in those cases where this is false.
   bool allow_preview_to_show_search_suggestions_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_