Fix WebGL getParameter bug in command buffer. 
Fix WebGL getParameter bug in command buffer. 

GetHelper was turning all getParameter return values into integers, even 
if they should have been floats. By returning false in GetHelper, it 
lets the individual DoGet(Float,Boolean,Integer)v functions skip this 
behavior and return the real value directly. 

BUG=51331
TEST=LayoutTests/fast/canvas/webgl/gl-get-calls.html
R=apatrick,gman
Patch by Adrienne Walker (enne@chromium.org)

Originally reviewed at http://codereview.chromium.org/3023042

Review URL: http://codereview.chromium.org/3402026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@60236 0039d316-1c4b-4281-b951-d872f2087c98

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