mac, yosemite: Resize button causes fullscreen effect.

chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm b/chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm
index 39bb2400afe7c9b0100f04f541703b84ab16bb52..2d8fca884bcb855a3ce86183f8249c1df4eadea0 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm
@@ -31,6 +31,7 @@
 #import "chrome/browser/ui/cocoa/nsview_additions.h"
 #import "chrome/browser/ui/cocoa/profiles/avatar_base_controller.h"
 #import "chrome/browser/ui/cocoa/tab_contents/overlayable_contents_controller.h"
+#import "chrome/browser/ui/cocoa/tabs/tab_strip_view.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/find_bar/find_bar.h"
@@ -213,6 +214,19 @@ class BrowserWindowControllerTest : public InProcessBrowserTest {
         convertPoint:info_bar_top toView:nil];
     return icon_bottom.y - info_bar_top.y;
   }
+  // The traffic lights should always be in front of the content view and the
+  // tab strip view. Since the traffic lights change across OSX versions, this
+  // test verifies that the contentView is in the back, and if the tab strip
+  // view is a sibling, it is directly in front of the content view.
+  void VerifyTrafficLightZOrder() const {
+    NSView* contentView = [[controller() window] contentView];
+    NSView* rootView = [contentView superview];
+    EXPECT_EQ(contentView, [[rootView subviews] objectAtIndex:0]);
+
+    NSView* tabStripView = [controller() tabStripView];
+    if ([[rootView subviews] containsObject:tabStripView])
+      EXPECT_EQ(tabStripView, [[rootView subviews] objectAtIndex:1]);
+  }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserWindowControllerTest);
@@ -462,3 +476,18 @@ IN_PROC_BROWSER_TEST_F(BrowserWindowControllerTest,
   EXPECT_EQ(std::min(GetExpectedTopInfoBarTipHeight(), max_tip_height),
             [[controller() infoBarContainerController] overlappingTipHeight]);
 }
+
+IN_PROC_BROWSER_TEST_F(BrowserWindowControllerTest, TrafficLightZOrder) {
+  // Verify z order immediately after creation.
+  VerifyTrafficLightZOrder();
+
+  // Toggle overlay, then verify z order.
+  [controller() showOverlay];
+  [controller() removeOverlay];
+  VerifyTrafficLightZOrder();
+
+  // Toggle immersive fullscreen, then verify z order.
+  [controller() enterImmersiveFullscreen];
+  [controller() exitImmersiveFullscreen];
+  VerifyTrafficLightZOrder();
+}