Browser should get notified if a views textfield changes focus. In addition,

chrome/browser/ui/touch/frame/touch_browser_frame_view.cc

Index: chrome/browser/ui/touch/frame/touch_browser_frame_view.cc
diff --git a/chrome/browser/ui/touch/frame/touch_browser_frame_view.cc b/chrome/browser/ui/touch/frame/touch_browser_frame_view.cc
index 3838b4f6883f50634210874bfd8cab58b3655cec..95018e5524567cdfee59de5319bfa60949337a8c 100644
--- a/chrome/browser/ui/touch/frame/touch_browser_frame_view.cc
+++ b/chrome/browser/ui/touch/frame/touch_browser_frame_view.cc
@@ -35,7 +35,8 @@ TouchBrowserFrameView::TouchBrowserFrameView(BrowserFrame* frame,
                                              BrowserView* browser_view)
     : OpaqueBrowserFrameView(frame, browser_view),
       keyboard_showing_(false),
-      keyboard_(NULL) {
+      keyboard_(NULL),
+      focus_listener_added_(false) {
   registrar_.Add(this,
                  NotificationType::NAV_ENTRY_COMMITTED,
                  NotificationService::AllSources());
@@ -50,6 +51,9 @@ TouchBrowserFrameView::TouchBrowserFrameView(BrowserFrame* frame,
 }
 
 TouchBrowserFrameView::~TouchBrowserFrameView() {
+  if (focus_listener_added_ && GetFocusManager()) {
+    GetFocusManager()->RemoveFocusChangeListener(this);
+  }

[oshima, 2011/01/27 23:39:09]

no {} for single line condition.

[varunjain, 2011/01/28 01:55:57]

moved removing the focus listener to ViewHierarchyCHange. PTAL

   browser_view()->browser()->tabstrip_model()->RemoveObserver(this);
 }
 
@@ -63,6 +67,17 @@ void TouchBrowserFrameView::Layout() {
   keyboard_->SetBounds(GetBoundsForReservedArea());
 }
 
+void TouchBrowserFrameView::FocusWillChange(views::View* focused_before,
+                                            views::View* focused_now) {
+  if (!focused_before ||
+      (focused_now && focused_now->GetContentType()
+          != focused_before->GetContentType())) {
+    // TODO: support other types of keyboard.
+    UpdateKeyboardAndLayout(
+        focused_now->GetContentType() == views::View::GENERIC_INPUT);
+  }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // TouchBrowserFrameView, protected:
 int TouchBrowserFrameView::GetReservedHeight() const {
@@ -72,6 +87,16 @@ int TouchBrowserFrameView::GetReservedHeight() const {
   return 0;
 }
 
+void TouchBrowserFrameView::ViewHierarchyChanged(bool is_add,
+                                                 View* parent,
+                                                 View* child) {
+  OpaqueBrowserFrameView::ViewHierarchyChanged(is_add, parent, child);
+  if (!focus_listener_added_ && GetFocusManager()) {
+    GetFocusManager()->AddFocusChangeListener(this);
+    focus_listener_added_ = true;
+  }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // TouchBrowserFrameView, private: