Add support for paths.

Rendering is implementing by rasterizing the paths into A8 textures.
This cna be extremely inefficient if the path changes often.

Change-Id: I609343f304ae38e0d319359403ee73b9b5b3c93a
diff --git a/libs/hwui/ProgramCache.cpp b/libs/hwui/ProgramCache.cpp
index 3205258..8a97b4c 100644
--- a/libs/hwui/ProgramCache.cpp
+++ b/libs/hwui/ProgramCache.cpp
@@ -90,7 +90,7 @@
 };
 const char* gFS_Main =
         "\nvoid main(void) {\n"
-        "    vec4 fragColor;\n";
+        "    lowp vec4 fragColor;\n";
 const char* gFS_Main_FetchColor =
         "    fragColor = color;\n";
 const char* gFS_Main_FetchTexture =