Grab mouse capture in the WM_POINTERDOWN message handler in the omnibox.

chrome/browser/ui/views/omnibox/omnibox_view_win.cc

Index: chrome/browser/ui/views/omnibox/omnibox_view_win.cc
===================================================================
--- chrome/browser/ui/views/omnibox/omnibox_view_win.cc	(revision 160963)
+++ chrome/browser/ui/views/omnibox/omnibox_view_win.cc	(working copy)
@@ -1371,6 +1371,11 @@
     // Enable TSF support of RichEdit.
     SetEditStyle(SES_USECTF, SES_USECTF);
   }
+
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
+    bool touch_mode = !!RegisterTouchWindow(m_hWnd, TWF_WANTPALM);
+    DCHECK(touch_mode);
+  }
   SetMsgHandled(FALSE);
   return 0;
 }
@@ -1394,6 +1399,11 @@
   return 0;
 }
 
+void OmniboxViewWin::OnDestroy() {
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8)
+    UnregisterTouchWindow(m_hWnd);
+}
+
 LRESULT OmniboxViewWin::OnImeComposition(UINT message,
                                          WPARAM wparam,
                                          LPARAM lparam) {
@@ -1446,29 +1456,42 @@
   return DefWindowProc(message, wparam, lparam);
 }
 
+LRESULT OmniboxViewWin::OnTouchEvent(UINT message,
+                                     WPARAM wparam,
+                                     LPARAM lparam) {
+  // There is a bug in Windows 8 where in the generated mouse messages
+  // after touch go to the window which previously had focus. This means that
+  // if a user taps the omnibox to give it focus, we don't get the simulated
+  // WM_LBUTTONDOWN, and thus don't properly select all the text. To ensure
+  // that we  get this message, we capture the mouse when the user is doing a

[Peter Kasting, 2012/10/12 00:19:59]

Nit: Extra space

[ananta, 2012/10/12 00:37:18]

Done.

+  // single-point tap on an unfocused model.
+  if (wparam == 1 && !model()->has_focus()) {

[Peter Kasting, 2012/10/12 00:19:59]

Nit: Rest of this code puts parens around all binary subexpressions

[ananta, 2012/10/12 00:37:18]

Do you mean to parenthesize point.dwFlags & TOUCHEVENTF_DOWN
for e.g?

+    TOUCHINPUT point = {0};
+    if (GetTouchInputInfo(reinterpret_cast<HTOUCHINPUT>(lparam), 1,
+                          &point, sizeof(TOUCHINPUT))) {
+      if (point.dwFlags & TOUCHEVENTF_DOWN) {
+        SetFocus();
+        SetCapture();
+      } else if (point.dwFlags & TOUCHEVENTF_UP) {
+        ReleaseCapture();
+      }
+    }
+  }
+  SetMsgHandled(false);
+  return 0;
+}
+
 LRESULT OmniboxViewWin::OnPointerDown(UINT message,
                                       WPARAM wparam,
                                       LPARAM lparam) {
-  if (!model()->has_focus())
-    SetFocus();
-
   if (IS_POINTER_FIRSTBUTTON_WPARAM(wparam)) {
     TrackMousePosition(kLeft, CPoint(GET_X_LPARAM(lparam),
                                      GET_Y_LPARAM(lparam)));
   }
-
   SetMsgHandled(false);
-
   return 0;
 }
 
-LRESULT OmniboxViewWin::OnPointerUp(UINT message, WPARAM wparam,
-                                    LPARAM lparam) {
-  SetMsgHandled(false);
-
-  return 0;
-}
-
 void OmniboxViewWin::OnKeyDown(TCHAR key,
                                UINT repeat_count,
                                UINT flags) {