Check if drawFocusRingMaskWithFrame:inView: exists when drawing focus ring

Source/platform/mac/WebCoreNSCellExtras.mm

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 #import "platform/mac/WebCoreNSCellExtras.h"
 
-#if !BUTTON_CELL_DRAW_WITH_FRAME_DRAWS_FOCUS_RING
+#if !defined(MAC_OS_X_VERSION_10_7) || MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
+
+@interface NSCell (LionSDKDeclarations)
+- (void)drawFocusRingMaskWithFrame:(NSRect)cellFrame inView:(NSView *)controlView;
+@end
+
+#endif  // !defined(MAC_OS_X_VERSION_10_7) || MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
 
 @implementation NSCell (WebCoreFocusRingDrawing)
 
 - (void)_web_drawFocusRingWithFrame:(NSRect)cellFrame inView:(NSView *)controlView

[Robert Sesek, 2015/06/08 18:54:28]

We should rename this. Apple still ship WebCore (which does get transitively
linked into Chromium) with this exact same symbol name -[NSCell
_web_drawFocusRingWithFrame:inView:]. Because ObjC has a flat namespace, this
could conflict with that symbol. I suggest renaming this to:

- (void)cr_drawFocusRingWithFrame:inView:

That way the symbols won't ever collide.

 {
+    // FIXME: Remove this check when we drop support for Mac OS X 10.6
+    if (![self respondsToSelector:@selector(drawFocusRingMaskWithFrame:inView:)])
+        return;
     CGContextRef cgContext = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
     CGContextSaveGState(cgContext);
     NSSetFocusRingStyle(NSFocusRingOnly);
     CGContextBeginTransparencyLayerWithRect(cgContext, NSRectToCGRect(cellFrame), 0);
     [self drawFocusRingMaskWithFrame:cellFrame inView:controlView];
     CGContextEndTransparencyLayer(cgContext);
     CGContextRestoreGState(cgContext);
 }
 
 @end
-
-#endif // !BUTTON_CELL_DRAW_WITH_FRAME_DRAWS_FOCUS_RING