aura: Hide transient children of a Window when the window hides.

BUG=121409
TEST=manual

Review URL: https://chromiumcodereview.appspot.com/10181005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133575 0039d316-1c4b-4281-b951-d872f2087c98

ui/aura/window.cc

@@ -183,6 +183,10 @@ void Window::Show() {
 }
 
 void Window::Hide() {
+  for (Windows::iterator it = transient_children_.begin();
+       it != transient_children_.end(); ++it) {
+    (*it)->Hide();
+  }
   SetVisible(false);
   ReleaseCapture();
 }

ui/aura/window_unittest.cc

@@ -1042,6 +1042,11 @@ TEST_F(WindowTest, TransientChildren) {
   ASSERT_EQ(2u, parent->children().size());
   EXPECT_EQ(w3.get(), parent->children()[0]);
   EXPECT_EQ(w1.get(), parent->children()[1]);
+
+  // Hiding parent should hide transient children.
+  EXPECT_TRUE(w2->IsVisible());
+  w1->Hide();
+  EXPECT_FALSE(w2->IsVisible());
 }
 
 // Tests that when a focused window is closed, its parent inherits the focus.