[Merge] ~smspillaz/compiz:fix-blur-frag-shader-precision-gles into compiz:master

[Sam Spilsbury]

Sam Spilsbury has proposed merging ~smspillaz/compiz:fix-blur-frag-shader-precision-gles into compiz:master.

Commit message:




Requested reviews:
  Compiz Maintainers (compiz-team)

For more details, see:
https://code.launchpad.net/~smspillaz/compiz/+git/compiz/+merge/412180

Background blurring wasn't working on GLES platforms. Running in the terminal would get a bunch of these messages:

0:1(1): error: No precision specified in this scope for type `vec2'                                                                                                                                                                                                             
0:6(2): error: No precision specified in this scope for type `vec4'                                                                                                                                                                                                             
0:6(2): error: No precision specified in this scope for type `vec4'                                                                                                                                                                                                             
0:7(2): error: No precision specified in this scope for type `vec4'                                                                                                                                                                                                             
0:7(2): error: No precision specified in this scope for type `vec4'                                                                                                                                                                                                             
0:8(2): error: No precision specified in this scope for type `vec2'                                                                                                                                                                                                             
0:8(2): error: No precision specified in this scope for type `vec2'                                                                                                                                                                                                             
0:9(2): error: No precision specified in this scope for type `vec2'                                                                                                                                                                                                             0:9(2): error: No precision specified in this scope for type `vec2'                                                                                                                                                                                                             
0:10(2): error: No precision specified in this scope for type `vec4'

This change sets the precision to medium on the fragment shader by default, so that we don't get these errors and it works again.
-- 
Your team Compiz Maintainers is requested to review the proposed merge of ~smspillaz/compiz:fix-blur-frag-shader-precision-gles into compiz:master.
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