Update from https://crrev.com/317530

gpu/command_buffer/client/program_info_manager.cc

Index: gpu/command_buffer/client/program_info_manager.cc
diff --git a/gpu/command_buffer/client/program_info_manager.cc b/gpu/command_buffer/client/program_info_manager.cc
index 779d914ac4c441a6fc40d0a00a958281a7df7c83..89e8913a63ae382ba1dc630e88e707549c01ba4d 100644
--- a/gpu/command_buffer/client/program_info_manager.cc
+++ b/gpu/command_buffer/client/program_info_manager.cc
@@ -332,11 +332,10 @@ void ProgramInfoManager::Program::UpdateES2(const std::vector<int8>& result) {
   if (!link_status_) {
     return;
   }
-  attrib_infos_.clear();
-  uniform_infos_.clear();
-  frag_data_locations_.clear();
-  max_attrib_name_length_ = 0;
-  max_uniform_name_length_ = 0;
+  DCHECK_EQ(0u, attrib_infos_.size());
+  DCHECK_EQ(0u, uniform_infos_.size());
+  DCHECK_EQ(0, max_attrib_name_length_);
+  DCHECK_EQ(0, max_uniform_name_length_);
   const ProgramInput* inputs = LocalGetAs<const ProgramInput*>(
       result, sizeof(*header),
       sizeof(ProgramInput) * (header->num_attribs + header->num_uniforms));
@@ -382,8 +381,8 @@ void ProgramInfoManager::Program::UpdateES3UniformBlocks(
     // This should only happen on a lost context.
     return;
   }
-  uniform_blocks_.clear();
-  active_uniform_block_max_name_length_ = 0;
+  DCHECK_EQ(0u, uniform_blocks_.size());
+  DCHECK_EQ(0u, active_uniform_block_max_name_length_);
 
   // |result| comes from GPU process. We consider it trusted data. Therefore,
   // no need to check for overflows as the GPU side did the checks already.
@@ -453,7 +452,7 @@ void ProgramInfoManager::Program::UpdateES3Uniformsiv(
     // This should only happen on a lost context.
     return;
   }
-  uniforms_es3_.clear();
+  DCHECK_EQ(0u, uniforms_es3_.size());
 
   // |result| comes from GPU process. We consider it trusted data. Therefore,
   // no need to check for overflows as the GPU side did the checks already.
@@ -495,8 +494,8 @@ void ProgramInfoManager::Program::UpdateES3TransformFeedbackVaryings(
     // This should only happen on a lost context.
     return;
   }
-  transform_feedback_varyings_.clear();
-  transform_feedback_varying_max_length_ = 0;
+  DCHECK_EQ(0u, transform_feedback_varyings_.size());
+  DCHECK_EQ(0u, transform_feedback_varying_max_length_);
 
   // |result| comes from GPU process. We consider it trusted data. Therefore,
   // no need to check for overflows as the GPU side did the checks already.