Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/instant/instant_controller.cc

Index: chrome/browser/instant/instant_controller.cc
diff --git a/chrome/browser/instant/instant_controller.cc b/chrome/browser/instant/instant_controller.cc
index f70b38a0e4e43ee36f9010e9b2aec0833664c2d2..6309f0e2060228be6d4a6dc655a5edc75499f2ff 100644
--- a/chrome/browser/instant/instant_controller.cc
+++ b/chrome/browser/instant/instant_controller.cc
@@ -625,6 +625,22 @@ void InstantController::InstantSupportDetermined(InstantLoader* loader,
       content::NotificationService::NoDetails());
 }
 
+void InstantController::OnWebSearchBoxBlur(InstantLoader* loader) {
+  if (loader_ != loader || mode_ != EXTENDED ||
+      model_.preview_state() != InstantModel::CUSTOM_NTP_CONTENT)
+    return;
+
+  browser_->OnWebSearchBoxBlur();

[dhollowa, 2012/11/15 21:31:00]

BrowserInstantController is not needed to set this.  You should be able to call
|chrome::search::SearchTabHelper::FromWebContents| on the current tab and set
the focus state directly.

+}
+
+void InstantController::OnWebSearchBoxFocus(InstantLoader* loader) {
+  if (loader_ != loader || mode_ != EXTENDED ||
+      model_.preview_state() != InstantModel::CUSTOM_NTP_CONTENT)
+    return;
+
+  browser_->OnWebSearchBoxFocus();
+}
+
 void InstantController::SwappedTabContents(InstantLoader* loader) {
   if (loader_ == loader)
     model_.SetPreviewContents(GetPreviewContents());