Implement SamplerManager in the command buffer

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index c704c285820ed0ae98fa700f59888b0a2f3c7600..6351bf2b84f12df3299cfe27a5582bb61fb713fe 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -314,6 +314,13 @@ void GLES2DecoderTestBase::InitDecoderWithCommandLine(
             use_default_textures ? TestHelper::kServiceDefaultTexture2dId : 0))
         .Times(1)
         .RetiresOnSaturation();
+
+      if (group_->feature_info()->feature_flags().enable_samplers) {
+        EXPECT_CALL(*gl_,
+            BindSampler(tt, 0))
+            .Times(1)
+            .RetiresOnSaturation();
+      }
   }
   EXPECT_CALL(*gl_, ActiveTexture(GL_TEXTURE0))
       .Times(1)