Pulls display related changes from mojo to chrome

mojo/services/view_manager/view_locator.cc

Index: mojo/services/view_manager/view_locator.cc
diff --git a/mojo/services/view_manager/view_locator.cc b/mojo/services/view_manager/view_locator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..672b7c83e5a8dac3a4e5276359eb8e4d0b852d2d
--- /dev/null
+++ b/mojo/services/view_manager/view_locator.cc
@@ -0,0 +1,35 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/services/view_manager/view_locator.h"
+
+#include "mojo/services/view_manager/server_view.h"
+
+namespace view_manager {
+
+const ServerView* FindDeepestVisibleView(const ServerView* view,
+                                         const gfx::Point& location) {
+  for (const ServerView* child : view->GetChildren()) {
+    if (!child->visible())
+      continue;
+
+    // TODO(sky): support transform.
+    const gfx::Point child_location(location.x() - child->bounds().x(),
+                                    location.y() - child->bounds().y());
+    if (child_location.x() >= 0 && child_location.y() >= 0 &&
+        child_location.x() < child->bounds().width() &&
+        child_location.y() < child->bounds().height()) {
+      return FindDeepestVisibleView(child, child_location);
+    }
+  }
+  return view;
+}
+
+ServerView* FindDeepestVisibleView(ServerView* view,
+                                   const gfx::Point& location) {
+  return const_cast<ServerView*>(
+      FindDeepestVisibleView(const_cast<const ServerView*>(view), location));
+}
+
+}  // namespace view_manager