Expose GpuMemoryBufferId through glGetImageivCHROMIUM.

gpu/command_buffer/cmd_buffer_functions.txt

Index: gpu/command_buffer/cmd_buffer_functions.txt
diff --git a/gpu/command_buffer/cmd_buffer_functions.txt b/gpu/command_buffer/cmd_buffer_functions.txt
index 0f51880efba5568cd0f19c2802bbfb7eabc04f95..cd6619826f412da85425e4ab77c917ccbb720317 100644
--- a/gpu/command_buffer/cmd_buffer_functions.txt
+++ b/gpu/command_buffer/cmd_buffer_functions.txt
@@ -276,6 +276,7 @@ GL_APICALL void         GL_APIENTRY glGetUniformsES3CHROMIUM (GLidProgram progra
 GL_APICALL GLuint       GL_APIENTRY glCreateImageCHROMIUM (ClientBuffer buffer, GLsizei width, GLsizei height, GLenum internalformat);
 GL_APICALL void         GL_APIENTRY glDestroyImageCHROMIUM (GLuint image_id);
 GL_APICALL GLuint       GL_APIENTRY glCreateGpuMemoryBufferImageCHROMIUM (GLsizei width, GLsizei height, GLenum internalformat, GLenum usage);
+GL_APICALL GLint        GL_APIENTRY glGetImageivCHROMIUM (GLuint image_id, GLenum param);

[piman, 2016/05/26 21:16:07]

So, if we call it glGetImageivCHROMIUM, it should look like an "iv" function,
i.e. one that takes a GLint* (for the return value) - that's the most GL-y way,
and slightly more scalable because we can also have other variations for other
queries we might need (e.g. an "uiv" version to get a GLuint, or if we want to
return >1 values).

If we want to return a GLint instead (that's less consistent, only a couple of
API calls do that), it shouldn't be "iv", but then again glGetImageCHROMIUM
would be weird by itself. glGetImageInfoCHROMIUM maybe?

[erikchen, 2016/05/26 21:41:27]

Changed the signature to be:
void glGetImageivCHROMIUM(GLuint image_id, GLenum param, GLint* data);

 GL_APICALL void         GL_APIENTRY glGetTranslatedShaderSourceANGLE (GLidShader shader, GLsizeiNotNegative bufsize, GLsizeiOptional* length, char* source);
 GL_APICALL void         GL_APIENTRY glPostSubBufferCHROMIUM (GLint x, GLint y, GLint width, GLint height);
 GL_APICALL void         GL_APIENTRY glTexImageIOSurface2DCHROMIUM (GLenumTextureBindTarget target, GLsizei width, GLsizei height, GLuint ioSurfaceId, GLuint plane);