Add new module for distance field generation.

gm/gmmain.cpp

Index: gm/gmmain.cpp
diff --git a/gm/gmmain.cpp b/gm/gmmain.cpp
index 165c5affb7278556732e91080e5931c2f20b7231..de9e1a15a0566934abfcfc21be23863916b0a93c 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -46,6 +46,7 @@
 
 #ifdef SK_DEBUG
 static const bool kDebugOnly = true;
+#define GR_DUMP_FONT_CACHE 0
 #else
 static const bool kDebugOnly = false;
 #endif
@@ -2408,6 +2409,18 @@ int tool_main(int argc, char** argv) {
     }
 #endif
 
+#if GR_DUMP_FONT_CACHE
+    for (int i = 0; i < configs.count(); i++) {
+        ConfigData config = gRec[configs[i]];
+
+        if (kGPU_Backend == config.fBackend) {
+            GrContext* gr = grFactory->get(config.fGLContextType);
+
+           gr->dumpFontCache();
+        }
+    }
+#endif
+
     delete grFactory;
 #endif
     SkGraphics::Term();