Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/instant/instant_loader.cc

Index: chrome/browser/instant/instant_loader.cc
diff --git a/chrome/browser/instant/instant_loader.cc b/chrome/browser/instant/instant_loader.cc
index 9f2b82b9482a2d70b3f10895a8b4f893d91109a9..14b945f23e87465ae61da81da0f7fbff00f27c85 100644
--- a/chrome/browser/instant/instant_loader.cc
+++ b/chrome/browser/instant/instant_loader.cc
@@ -98,6 +98,9 @@ class InstantLoader::WebContentsDelegateImpl
   // Message from the renderer determining whether it supports the Instant API.
   void OnInstantSupportDetermined(int page_id, bool result);
 
+  // Message from the renderer saying the web searchbox focus state changed.
+  void OnWebSearchBoxFocusChange(int page_id, bool is_focused);
+
   // Message from the renderer requesting the preview be shown.
   void OnShowInstantPreview(int page_id,
                             InstantShownReason reason,
@@ -210,6 +213,8 @@ bool InstantLoader::WebContentsDelegateImpl::OnMessageReceived(
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_SetSuggestions, OnSetSuggestions)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_InstantSupportDetermined,
                         OnInstantSupportDetermined)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_OnWebSearchBoxFocusChange,
+                        OnWebSearchBoxFocusChange);
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_ShowInstantPreview,
                         OnShowInstantPreview);
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -241,6 +246,19 @@ void InstantLoader::WebContentsDelegateImpl::OnInstantSupportDetermined(
     MaybeSetAndNotifyInstantSupportDetermined(result);
 }
 
+void InstantLoader::WebContentsDelegateImpl::OnWebSearchBoxFocusChange(
+    int page_id,
+    bool is_focused) {
+  DCHECK(loader_->preview_contents());
+  DCHECK(loader_->preview_contents_->web_contents());
+  content::NavigationEntry* entry = loader_->preview_contents_->web_contents()->
+                                        GetController().GetActiveEntry();
+  if (entry && page_id == entry->GetPageID()) {
+    MaybeSetAndNotifyInstantSupportDetermined(true);
+    loader_->controller_->OnWebSearchBoxFocusChange(loader_, is_focused);
+  }
+}
+
 void InstantLoader::WebContentsDelegateImpl::OnShowInstantPreview(
     int page_id,
     InstantShownReason reason,