Initial work to get ETC1 data up to the GPU

Committed: http://code.google.com/p/skia/source/detail?r=15001

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

Author: krajcevski@google.com

Review URL: https://codereview.chromium.org/302783002
diff --git a/gyp/gpu.gyp b/gyp/gpu.gyp
index c69a94a..fd81d60 100644
--- a/gyp/gpu.gyp
+++ b/gyp/gpu.gyp
@@ -84,6 +84,7 @@
       'dependencies': [
         'core.gyp:*',
         'utils.gyp:*',
+        'etc1.gyp:libetc1',
       ],
       'includes': [
         'gpu.gypi',