Add sampler related ES3 APIs to command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index f97710e86a61009ce7b6b54517f63040d5f8cb3b..edab3d37ccb78210ada8a4acc01354f6ab0577f6 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1473,6 +1473,11 @@ class GLES2DecoderImpl : public GLES2Decoder,
   // Wrapper for glReleaseShaderCompiler.
   void DoReleaseShaderCompiler() { }
 
+  // Wrappers for glSamplerParameter*v functions.
+  void DoSamplerParameterfv(
+      GLuint sampler, GLenum pname, const GLfloat* params);
+  void DoSamplerParameteriv(GLuint sampler, GLenum pname, const GLint* params);
+
   // Wrappers for glTexParameter functions.
   void DoTexParameterf(GLenum target, GLenum pname, GLfloat param);
   void DoTexParameteri(GLenum target, GLenum pname, GLint param);
@@ -5858,6 +5863,18 @@ void GLES2DecoderImpl::DoLinkProgram(GLuint program_id) {
   ExitCommandProcessingEarly();
 };
 
+void GLES2DecoderImpl::DoSamplerParameterfv(
+    GLuint sampler, GLenum pname, const GLfloat* params) {

[piman, 2015/01/09 07:10:57]

These 2 methods need to be disabled if !unsafe_es3_apis_enabled(), otherwise
they will call into NULL on an ES2 implementation, and crash the GPU process.

[Zhenyao Mo, 2015/01/09 17:45:27]

The check happens in Handle* function, which is the only place that calls the
Do* function.

+  DCHECK(params);
+  glSamplerParameterf(sampler, pname, params[0]);

[Zhenyao Mo, 2014/12/10 01:59:12]

This is use glSamplerParameterf to implement glSamplerParameterfv, because only
one param is allowed.

+}
+
+void GLES2DecoderImpl::DoSamplerParameteriv(
+    GLuint sampler, GLenum pname, const GLint* params) {
+  DCHECK(params);
+  glSamplerParameteri(sampler, pname, params[0]);

[Zhenyao Mo, 2014/12/10 01:59:12]

This is use glSamplerParameteri to implement glSamplerParameteriv, because only
one param is allowed.

+}
+
 void GLES2DecoderImpl::DoTexParameterf(
     GLenum target, GLenum pname, GLfloat param) {
   TextureRef* texture = texture_manager()->GetTextureInfoForTarget(