Start canonicalizing color for all A8 textblobs

tools/sk_tool_utils.h

Index: tools/sk_tool_utils.h
diff --git a/tools/sk_tool_utils.h b/tools/sk_tool_utils.h
index 0299e742d2cd847eb93a9a94428b6250b3e3c562..d9345a6b922f008999ad12092ff990dc0f97dabc 100644
--- a/tools/sk_tool_utils.h
+++ b/tools/sk_tool_utils.h
@@ -19,6 +19,7 @@ class SkCanvas;
 class SkPaint;
 class SkShader;
 class SkTestFont;
+class SkTextBlobBuilder;
 
 namespace sk_tool_utils {
 
@@ -69,6 +70,10 @@ namespace sk_tool_utils {
         }
     };
 
+    // A helper for inserting a drawtext call into a SkTextBlobBuilder
+    void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
+                          SkScalar x, SkScalar y);
+
 }  // namespace sk_tool_utils
 
 #endif  // sk_tool_utils_DEFINED