Add support for dark theme in Mac Notification Center

base/mac/sdk_forward_declarations.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains forward declarations for items in later SDKs than the
 // default one with which Chromium is built (currently 10.6).
 // If you call any function from this header, be sure to check at runtime for
 // respondsToSelector: before calling these functions (else your code will crash
 // on older OS X versions that chrome still supports).
 
@@ skipping 226 matching lines @@
 
 - (void)publish;
 - (void)unpublish;
 
 @end
 
 @interface NSScreen (MavericksSDK)
 + (BOOL)screensHaveSeparateSpaces;
 @end
 
+// NSAppearance is a new class in the 10.9 SDK. New classes cannot be
+// forward-declared because they also require an @implementation, which would
+// produce conflicting linkage. Instead, just declare the necessary pieces of
+// the interface as a protocol, and treat objects of this type as id.
+@protocol CrNSAppearance
+- (NSString*)name;

[Robert Sesek, 2014/09/12 19:16:23]

-name is a new property in 10.10, which is why it doesn't show up in that link.
However I tested a different way to do this, which I think is the best way to go
(sorry for the change in recommendation!). Remove -name and replace it with:

+ (id<NSObject>)appearanceNamed:(NSString*)name;

Then you'd use this by doing:

Class<CrNSAppearance> nsAppearanceClass = NSClassFromString(@"NSAppearance");
if ([nsAppearanceClass respondsToSelector:@selector(appearanceNamed:)]) {
  id<NSObject> darkAppearance = [nsAppearanceClass
appearanceNamed:NSAppearanceNameVibrantDark];
  if ([[self effectiveAppearance] isEqual:darkAppearance]) {
    // in dark mode
  }
}

[dewittj, 2014/09/12 23:24:20]

Done.

+@end
+
 @interface NSView (MavericksSDK)
 - (void)setCanDrawSubviewsIntoLayer:(BOOL)flag;
+- (id<CrNSAppearance>)effectiveAppearance;
 @end
 
 enum {
   NSWindowOcclusionStateVisible = 1UL << 1,
 };
 typedef NSUInteger NSWindowOcclusionState;
 
 @interface NSWindow (MavericksSDK)
 - (NSWindowOcclusionState)occlusionState;
 @end
 
 #endif  // MAC_OS_X_VERSION_10_9
 
 #if !defined(MAC_OS_X_VERSION_10_10) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_10
 
 @interface NSUserActivity : NSObject
 
 @property (readonly, copy) NSString* activityType;
 @property (copy) NSURL* webPageURL;
 
 @end
 
 BASE_EXPORT extern "C" NSString* const NSUserActivityTypeBrowsingWeb;
 
+BASE_EXPORT extern "C" NSString* const NSAppearanceNameVibrantDark;
+
 #endif  // MAC_OS_X_VERSION_10_10
 
 #endif  // BASE_MAC_SDK_FORWARD_DECLARATIONS_H_