Update from https://crrev.com/315085

gpu/command_buffer/service/program_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/program_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 544 matching lines @@
   }
   if (!CheckVaryingsPacking(varyings_packing_option)) {
     set_log_info("Varyings over maximum register limit");
     return false;
   }
 
   TimeTicks before_time = TimeTicks::Now();
   bool link = true;
   ProgramCache* cache = manager_->program_cache_;
   if (cache) {
-    DCHECK(!attached_shaders_[0]->signature_source().empty() &&
-           !attached_shaders_[1]->signature_source().empty());
+    DCHECK(!attached_shaders_[0]->last_compiled_source().empty() &&
+           !attached_shaders_[1]->last_compiled_source().empty());
     ProgramCache::LinkedProgramStatus status = cache->GetLinkedProgramStatus(
-        attached_shaders_[0]->signature_source(),
+        attached_shaders_[0]->last_compiled_source(),
         vertex_translator,
-        attached_shaders_[1]->signature_source(),
+        attached_shaders_[1]->last_compiled_source(),
         fragment_translator,
         &bind_attrib_location_map_);
 
     if (status == ProgramCache::LINK_SUCCEEDED) {
       ProgramCache::ProgramLoadResult success =
           cache->LoadLinkedProgram(service_id(),
                                    attached_shaders_[0].get(),
                                    vertex_translator,
                                    attached_shaders_[1].get(),
                                    fragment_translator,
@@ skipping 969 matching lines @@
   DCHECK(program);
   program->ClearUniforms(&zero_);
 }
 
 int32 ProgramManager::MakeFakeLocation(int32 index, int32 element) {
   return index + element * 0x10000;
 }
 
 }  // namespace gles2
 }  // namespace gpu