Add handling alpha values in RRGGBBAA formatted styles.

experimental/SkV8Example/JsContext.cpp

Index: experimental/SkV8Example/JsContext.cpp
diff --git a/experimental/SkV8Example/JsContext.cpp b/experimental/SkV8Example/JsContext.cpp
index 5778172f27338c962f56482919fd1d54ba143f29..047147dc82785b3e44f96d3eb645612be4b8bb7e 100644
--- a/experimental/SkV8Example/JsContext.cpp
+++ b/experimental/SkV8Example/JsContext.cpp
@@ -158,13 +158,14 @@ void JsContext::SetStyle(Local<String> name, Local<Value> value,
                          const PropertyCallbackInfo<void>& info,
                          SkPaint& style) {
     Local<String> s = value->ToString();
-    if (s->Length() != 7) {
+    if (s->Length() != 7 && s->Length() != 9) {
         info.GetIsolate()->ThrowException(
                 v8::String::NewFromUtf8(
-                        info.GetIsolate(), "Invalid fill style format."));
+                        info.GetIsolate(),
+                        "Invalid fill style format length."));
         return;
     }
-    char buf[8];
+    char buf[10];
     s->WriteUtf8(buf, sizeof(buf));
 
     if (buf[0] != '#') {
@@ -174,8 +175,14 @@ void JsContext::SetStyle(Local<String> name, Local<Value> value,
         return;
     }
 
+    // Colors can be RRGGBBAA, but SkColor uses ARGB.
     long color = strtol(buf+1, NULL, 16);
-    style.setColor(SkColorSetA(SkColor(color), SK_AlphaOPAQUE));
+    uint32_t alpha = SK_AlphaOPAQUE;
+    if (s->Length() == 9) {
+        alpha = color & 0xFF;
+        color >>= 8;
+    }
+    style.setColor(SkColorSetA(SkColor(color), alpha));
 }
 
 void JsContext::GetFillStyle(Local<String> name,