Use active window if on current workspace for fullscreen mode.

ash/root_window_controller_unittest.cc

Index: ash/root_window_controller_unittest.cc
diff --git a/ash/root_window_controller_unittest.cc b/ash/root_window_controller_unittest.cc
index f331afb6912f52524f599ab8aeee6b3383cab0b3..be5911cc69779d1d0dce032fa3ed9c6df761f1ce 100644
--- a/ash/root_window_controller_unittest.cc
+++ b/ash/root_window_controller_unittest.cc
@@ -458,6 +458,40 @@ TEST_F(RootWindowControllerTest, GetWindowForFullscreenMode) {
   EXPECT_EQ(NULL, controller->GetWindowForFullscreenMode());
 }
 
+TEST_F(RootWindowControllerTest, MultipleDisplaysGetWindowForFullscreenMode) {
+  if (!SupportsMultipleDisplays())
+    return;
+
+  UpdateDisplay("600x600,600x600");
+  Shell::RootWindowControllerList controllers =
+      Shell::GetInstance()->GetAllRootWindowControllers();
+
+  Widget* w1 = CreateTestWidget(gfx::Rect(0, 0, 100, 100));
+  w1->Maximize();
+  Widget* w2 = CreateTestWidget(gfx::Rect(0, 0, 100, 100));
+  w2->SetFullscreen(true);
+  Widget* w3 = CreateTestWidget(gfx::Rect(600, 0, 100, 100));
+
+  EXPECT_EQ(w1->GetNativeWindow()->GetRootWindow(),
+      controllers[0]->root_window());
+  EXPECT_EQ(w2->GetNativeWindow()->GetRootWindow(),
+      controllers[0]->root_window());
+  EXPECT_EQ(w3->GetNativeWindow()->GetRootWindow(),
+      controllers[1]->root_window());
+
+  w2->Activate();
+  EXPECT_EQ(w2->GetNativeWindow(),
+      controllers[0]->GetWindowForFullscreenMode());
+  EXPECT_EQ(NULL, controllers[1]->GetWindowForFullscreenMode());
+
+  // Verify that the first root window controller remains in fullscreen mode
+  // when a window on the other display is activated.
+  w3->Activate();
+  EXPECT_EQ(w2->GetNativeWindow(),
+      controllers[0]->GetWindowForFullscreenMode());

[oshima, 2014/02/10 19:21:06]

indent

[flackr, 2014/02/10 21:45:28]

Done.

+  EXPECT_EQ(NULL, controllers[1]->GetWindowForFullscreenMode());

[oshima, 2014/02/10 19:21:06]

can you also add scenario where w1 is activated?

[flackr, 2014/02/10 21:45:28]

Done.

+}
+
 // Test that user session window can't be focused if user session blocked by
 // some overlapping UI.
 TEST_F(RootWindowControllerTest, FocusBlockedWindow) {