Add SkColorType getter on SkImage.

Bug: skia:
Change-Id: I131fb5f7faf3f54e0eb6d31b800d224e6d4963ce
Reviewed-on: https://skia-review.googlesource.com/114464
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/docs/SkImage_Reference.bmh b/docs/SkImage_Reference.bmh
index d11fa1c..f45862a 100644
--- a/docs/SkImage_Reference.bmh
+++ b/docs/SkImage_Reference.bmh
@@ -1070,6 +1070,24 @@
 
 # ------------------------------------------------------------------------------
 
+#Method SkColorType colorType() const
+#In Property
+#Line # returns Color_Type ##
+
+Returns Color_Type if known; otherwise, returns kUnknown_SkColorType.
+
+#Return Color_Type of Image ##
+
+#Example
+// incomplete
+##
+
+#SeeAlso SkImageInfo::colorType
+
+#Method ##
+
+# ------------------------------------------------------------------------------
+
 #Method SkColorSpace* colorSpace() const
 #In Property
 #Line # returns Color_Space ##