Fix custom cursor transparency compositing on MacOS

content/common/cursors/webcursor_unittest.cc

Index: content/common/cursors/webcursor_unittest.cc
diff --git a/content/common/cursors/webcursor_unittest.cc b/content/common/cursors/webcursor_unittest.cc
index 0fd1a751273643fee10b727255d3181223df2bb6..fc235bdf88b9ca0c0ff736694d36a9ff5a5a3fc9 100644
--- a/content/common/cursors/webcursor_unittest.cc
+++ b/content/common/cursors/webcursor_unittest.cc
@@ -242,6 +242,19 @@ TEST(WebCursorTest, AlphaConversion) {
     EXPECT_EQ(testColor,
               SkPreMultiplyColor(*cursor_info.custom_image.getAddr32(0,0)));
   }
+
+#if defined(OS_MACOSX)
+  // On MacOS, test roundtrip through NSCursor conversion

[Avi (use Gerrit), 2015/10/21 04:30:55]

finish sentences with periods

+  WebCursor custom_cursor_copy;
+  custom_cursor_copy.InitFromNSCursor(custom_cursor.GetNativeCursor());
+  custom_cursor_copy.GetCursorInfo(&cursor_info);
+  {
+    SkAutoLockPixels lock(cursor_info.custom_image);
+    EXPECT_EQ(kUnpremul_SkAlphaType, cursor_info.custom_image.alphaType());
+    EXPECT_EQ(testColor,
+              SkPreMultiplyColor(*cursor_info.custom_image.getAddr32(0,0)));
+  }  
+#endif
 }
 
 }  // namespace content