opengles emulator: fix glGetUnifrom

added state tracking for uniforms in program objects
for each active uniform in index i we will save its starting location
,size and type, so when calling glGetUniform on its location,
we can tell how many bytes we should read from the stream according to
the uniform's type

add some type and size definitions to functions
that calculate size from enum

some other fixes to the codec

Change-Id: I4ecdf41e752454a908d131e76bab113a616f2bc8

tools/emulator/opengl/system/GLESv2_enc/GL2EncoderUtils.h

@@ -19,5 +19,6 @@
 extern "C" {
     size_t pixelDataSize(void *self, GLsizei width, GLsizei height, GLenum format, GLenum type, int pack);
     size_t pixelDataSize3D(void *self, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, int pack);
+    GLenum uniformType(void * self, GLuint program, GLint location);
 };
 #endif