Add setPretendIsOccluded to CocoaTestHelperWindow.

This method simulates occlusion of the CocoaTestHelperWindow
(return value of occlusionState and posting
NSWindowDidChangeOcclusionStateNotification).

Bug: 668690
Change-Id: Ie6acab5d9ec2032dac92e8941b754fb42d45f7db
Reviewed-on: https://chromium-review.googlesource.com/802134
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521787}

ui/gfx/test/ui_cocoa_test_helper.h

@@ -20,6 +20,7 @@
 @interface CocoaTestHelperWindow : NSWindow {
  @private
   BOOL pretendIsKeyWindow_;
+  BOOL pretendIsOccluded_;
   BOOL useDefaultConstraints_;
 }
 
@@ -41,12 +42,18 @@
 // Set value to return for -isKeyWindow.
 - (void)setPretendIsKeyWindow:(BOOL)isKeyWindow;
 
+// Set value to return for -occlusionState and posts a
+// NSWindowDidChangeOcclusionStateNotification.
+- (void)setPretendIsOccluded:(BOOL)isOccluded;
+
 // Whether to use or ignore the default contraints for window sizing and
 // placement.
 - (void)setUseDefaultConstraints:(BOOL)useDefaultConstraints;
 
 - (BOOL)isKeyWindow;
 
+- (NSWindowOcclusionState)occlusionState;
+
 @end
 
 namespace ui {

ui/gfx/test/ui_cocoa_test_helper.mm

@@ -66,6 +66,13 @@ void NOINLINE ForceSystemLeaks() {
   pretendIsKeyWindow_ = flag;
 }
 
+- (void)setPretendIsOccluded:(BOOL)flag {
+  pretendIsOccluded_ = flag;
+  [[NSNotificationCenter defaultCenter]
+      postNotificationName:NSWindowDidChangeOcclusionStateNotification
+                    object:self];
+}
+
 - (void)setUseDefaultConstraints:(BOOL)useDefaultConstraints {
   useDefaultConstraints_ = useDefaultConstraints;
 }
@@ -74,6 +81,10 @@ void NOINLINE ForceSystemLeaks() {
   return pretendIsKeyWindow_;
 }
 
+- (NSWindowOcclusionState)occlusionState {
+  return pretendIsOccluded_ ? 0 : NSWindowOcclusionStateVisible;
+}
+
 - (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen*)screen {
   if (!useDefaultConstraints_)
     return frameRect;