Disable shader disk cache by default.

gpu/command_buffer/service/memory_program_cache.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/memory_program_cache.h"
 
 #include "base/base64.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/sha1.h"
@@ skipping 161 matching lines @@
     const std::string* program = eviction_helper_.PeekKey();
     const StoreMap::iterator found = store_.find(*program);
     const ProgramCacheValue* evicting = found->second.get();
     curr_size_bytes_ -= evicting->length;
     Evict(*program, evicting->shader_0_hash, evicting->shader_1_hash);
     store_.erase(found);
     eviction_helper_.PopKey();
   }
 
   if (!shader_callback.is_null() &&
-      !CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisableGpuShaderDiskCache)) {
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableGpuShaderDiskCache)) {
     std::string key;
     base::Base64Encode(sha_string, &key);
 
     GpuProgramProto* proto = GpuProgramProto::default_instance().New();
     proto->set_sha(sha, kHashLength);
     proto->set_format(format);
     proto->set_program(binary.get(), length);
 
     ShaderProto* vertex_shader = proto->mutable_vertex_shader();
     vertex_shader->set_sha(a_sha, kHashLength);
@@ skipping 102 matching lines @@
       attrib_map_0(_attrib_map_0),
       uniform_map_0(_uniform_map_0),
       shader_1_hash(_shader_1_hash, kHashLength),
       attrib_map_1(_attrib_map_1),
       uniform_map_1(_uniform_map_1) {}
 
 MemoryProgramCache::ProgramCacheValue::~ProgramCacheValue() {}
 
 }  // namespace gles2
 }  // namespace gpu