Add support to dump font cache texture for debug purposes

R=robertphillips@google.com, bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/25736002

git-svn-id: http://skia.googlecode.com/svn/trunk@11579 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 9dfe761..6b1efbe 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -642,6 +642,12 @@
     this->drawRect(*paint, r);
 }
 
+#ifdef SK_DEVELOPER
+void GrContext::dumpFontCache() const {
+    fFontCache->dump();
+}
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace {