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 1eadd705ac5e1b1521e76df6c5ae38f1c9df759e..afcafa64f3c4a8897441298ae7a57815a93d85bb 100644
--- a/chrome/browser/instant/instant_loader.cc
+++ b/chrome/browser/instant/instant_loader.cc
@@ -104,6 +104,14 @@ class InstantLoader::WebContentsDelegateImpl
                             int height,
                             InstantSizeUnits units);
 
+  // Message from the renderer requesting the browser to start capturing user
+  // key strokes.
+  void OnStartCapturingKeyStrokes(int page_id);
+
+  // Message from the renderer requesting the browser to stop capturing user
+  // key strokes.
+  void OnStopCapturingKeyStrokes(int page_id);
+
   void CommitFromPointerReleaseIfNecessary();
   void MaybeSetAndNotifyInstantSupportDetermined(bool supports_instant);
 
@@ -212,6 +220,10 @@ bool InstantLoader::WebContentsDelegateImpl::OnMessageReceived(
                         OnInstantSupportDetermined)
     IPC_MESSAGE_HANDLER(ChromeViewHostMsg_ShowInstantPreview,
                         OnShowInstantPreview);
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_StartCapturingKeyStrokes,
+                        OnStartCapturingKeyStrokes);
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_StopCapturingKeyStrokes,
+                        OnStopCapturingKeyStrokes);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -256,6 +268,30 @@ void InstantLoader::WebContentsDelegateImpl::OnShowInstantPreview(
   }
 }
 
+void InstantLoader::WebContentsDelegateImpl::OnStartCapturingKeyStrokes(
+    int page_id) {
+  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_->StartCapturingKeyStrokes(loader_);
+  }
+}
+
+void InstantLoader::WebContentsDelegateImpl::OnStopCapturingKeyStrokes(
+    int page_id) {
+  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);
+    // NOTE(samarth): we don't do anything else yet in this case.
+  }
+}
+
 void InstantLoader::WebContentsDelegateImpl
     ::CommitFromPointerReleaseIfNecessary() {
   if (is_pointer_down_from_activate_) {