[mac] Implement a windowed extension install/permissions prompt.

base/mac/sdk_forward_declarations.h

Index: base/mac/sdk_forward_declarations.h
diff --git a/base/mac/sdk_forward_declarations.h b/base/mac/sdk_forward_declarations.h
index a2d4013723d2cbb5ee7a021329348984b7006560..2fadf104ce0aa0fb10b166c6ed16fe2cc5011465 100644
--- a/base/mac/sdk_forward_declarations.h
+++ b/base/mac/sdk_forward_declarations.h
@@ -31,6 +31,15 @@ enum {
 };
 typedef NSUInteger NSEventSwipeTrackingOptions;
 
+enum {
+  NSWindowAnimationBehaviorDefault = 0,
+  NSWindowAnimationBehaviorNone = 2,
+  NSWindowAnimationBehaviorDocumentWindow = 3,
+  NSWindowAnimationBehaviorUtilityWindow = 4,
+  NSWindowAnimationBehaviorAlertPanel = 5
+};
+typedef NSInteger NSWindowAnimationBehavior;
+
 @interface NSEvent (LionSDK)
 + (BOOL)isSwipeTrackingFromScrollEventsEnabled;
 
@@ -61,6 +70,8 @@ typedef NSUInteger NSEventSwipeTrackingOptions;
 
 @interface NSWindow (LionSDK)
 - (CGFloat)backingScaleFactor;
+- (NSWindowAnimationBehavior)animationBehavior;
+- (void)setAnimationBehavior:(NSWindowAnimationBehavior)newAnimationBehavior;
 @end
 #endif  // MAC_OS_X_VERSION_10_7