Added API to query for active attribs and uniforms. These functions are modeled after glGetShaderiv, glGetProgramiv, glGetActiveAttrib, and glGetActiveUniform. The main difference between this and OpenGL API is that we do not have programs - just shaders.
BUG=26
Review URL: http://codereview.appspot.com/2183041

git-svn-id: https://angleproject.googlecode.com/svn/trunk@425 736b8ea6-26fd-11df-bfd4-992fa37f6226