Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/instant/instant_client.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_CLIENT_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_CLIENT_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 32 matching lines @@
     // Called upon determination of Instant API support. Usually in response to
     // SetContents() or when the page first finishes loading.
     virtual void InstantSupportDetermined(bool supports_instant) = 0;
 
     // Called when the page wants to be shown. Usually in response to Change(),
     // SendAutocompleteResults() or SearchModeChanged().
     virtual void ShowInstantPreview(InstantShownReason reason,
                                     int height,
                                     InstantSizeUnits units) = 0;
 
+    // Called when the page wants the browser to start capturing user key
+    // strokes.
+    virtual void StartCapturingKeyStrokes() = 0;
+
+    // Called when the page wants the browser to stop capturing user key
+    // strokes.
+    virtual void StopCapturingKeyStrokes() = 0;
+
    protected:
     virtual ~Delegate();
   };
 
   // Doesn't take ownership of |delegate|.
   explicit InstantClient(Delegate* delegate);
   virtual ~InstantClient();
 
   // Sets |contents| as the page to communicate with. |contents| can be NULL,
   // which effectively stops all communication.
@@ skipping 53 matching lines @@
       content::RenderViewHost* render_view_host) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   void SetSuggestions(int page_id,
                       const std::vector<InstantSuggestion>& suggestions);
   void InstantSupportDetermined(int page_id, bool result);
   void ShowInstantPreview(int page_id,
                           InstantShownReason reason,
                           int height,
                           InstantSizeUnits units);
+  void StartCapturingKeyStrokes(int page_id);
+  void StopCapturingKeyStrokes(int page_id);
 
   Delegate* const delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantClient);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CLIENT_H_