Implemented getActiveAttrib, getActiveUniform and readPixels. Removed

unnecessary UTF-8 conversion when converting C strings to WebKit
Strings. Re-enabled WebGL in Dev Channel builds.

BUG=http://crbug.com/21852
TEST=none (runs existing WebGL tests; more coming)

Review URL: http://codereview.chromium.org/308006

git-svn-id: http://src.chromium.org/svn/trunk/src/build@29632 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

features_override.gypi

@@ -10,7 +10,7 @@
     # features.gypi. Therefore, if an enable is listed in features.gypi
     # but not listed below, it will revert to its hardcoded webkit value.
     'feature_defines': [
-      'ENABLE_3D_CANVAS=0',
+      'ENABLE_3D_CANVAS=1',
       'ENABLE_CHANNEL_MESSAGING=1',
       'ENABLE_DATABASE=1',
       'ENABLE_DATAGRID=0',