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 109 matching lines @@
 
   // Invoked by InstantLoader to commit the preview.
   void CommitInstantLoader(InstantLoader* loader);
 
   // Invoked by InstantLoader to request that the preview be shown.
   void ShowInstantPreview(InstantLoader* loader,
                           InstantShownReason reason,
                           int height,
                           InstantSizeUnits units);
 
+  // Invoked by InstantLoader to request the browser to start capturing user key
+  // strokes.
+  void StartCapturingKeyStrokes(InstantLoader* loader);
+
   // Invoked by InstantLoader when it has determined whether or not the page
   // supports the Instant API.
   void InstantSupportDetermined(InstantLoader* loader, bool supports_instant);
 
   // Invoked by InstantLoader when it has swapped a different TabContents into
   // the preview, usually because a prerendered page was navigated to.
   void SwappedTabContents(InstantLoader* loader);
 
   // Invoked by InstantLoader when the preview gains focus, usually due to the
   // user clicking on it.
@@ skipping 109 matching lines @@
 
   // The timestamp at which query editing began. This value is used when the
   // first set of suggestions is processed and cleared when the overlay is
   // hidden.
   base::Time first_interaction_time_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_