[PDF] add drawTextOnPath support.

BUG=239
TBR=reed@google.com

Review URL: http://codereview.appspot.com/5363045

git-svn-id: http://skia.googlecode.com/svn/trunk@2638 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index dae0bdb..0c1e19a 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -888,7 +888,7 @@
     if (d.fClip->isEmpty()) {
         return;
     }
-    NOT_IMPLEMENTED("drawTextOnPath", false);
+    d.drawTextOnPath((const char*)text, len, path, matrix, paint);
 }
 
 void SkPDFDevice::drawVertices(const SkDraw& d, SkCanvas::VertexMode,