Use GpuPreferences to avoid directly accessing switches in gpu related code

gpu/command_buffer/service/memory_program_cache.cc

Index: gpu/command_buffer/service/memory_program_cache.cc
diff --git a/gpu/command_buffer/service/memory_program_cache.cc b/gpu/command_buffer/service/memory_program_cache.cc
index 3d6876f5b412fea5c2a09d456fe7ad3bee711cb5..fa6ed6bbf4b67659646bece3f4b48e579458f778 100644
--- a/gpu/command_buffer/service/memory_program_cache.cc
+++ b/gpu/command_buffer/service/memory_program_cache.cc
@@ -16,27 +16,10 @@
 #include "gpu/command_buffer/service/disk_cache_proto.pb.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
-#include "gpu/command_buffer/service/gpu_switches.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/command_buffer/service/shader_manager.h"
 #include "ui/gl/gl_bindings.h"
 
-namespace {
-
-size_t GetCacheSizeBytes() {
-  const base::CommandLine* command_line =
-      base::CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kGpuProgramCacheSizeKb)) {
-    size_t size;
-    if (base::StringToSizeT(
-        command_line->GetSwitchValueNative(switches::kGpuProgramCacheSizeKb),
-        &size))
-      return size * 1024;
-  }
-  return gpu::kDefaultMaxProgramCacheMemoryBytes;
-}
-
-}  // anonymous namespace
-
 namespace gpu {
 namespace gles2 {
 
@@ -166,14 +149,10 @@ void RunShaderCallback(const ShaderCacheCallback& callback,
 
 }  // namespace
 
-MemoryProgramCache::MemoryProgramCache()
-    : max_size_bytes_(GetCacheSizeBytes()),
-      curr_size_bytes_(0),
-      store_(ProgramMRUCache::NO_AUTO_EVICT) {
-}
-
-MemoryProgramCache::MemoryProgramCache(const size_t max_cache_size_bytes)
+MemoryProgramCache::MemoryProgramCache(const size_t max_cache_size_bytes,
+                                       const bool disable_gpu_shader_disk_cache)
     : max_size_bytes_(max_cache_size_bytes),
+      disable_gpu_shader_disk_cache_(disable_gpu_shader_disk_cache),
       curr_size_bytes_(0),
       store_(ProgramMRUCache::NO_AUTO_EVICT) {
 }
@@ -234,9 +213,7 @@ ProgramCache::ProgramLoadResult MemoryProgramCache::LoadLinkedProgram(
   shader_b->set_varying_map(value->varying_map_1());
   shader_b->set_output_variable_list(value->output_variable_list_1());
 
-  if (!shader_callback.is_null() &&
-      !base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisableGpuShaderDiskCache)) {
+  if (!shader_callback.is_null() && !disable_gpu_shader_disk_cache_) {
     scoped_ptr<GpuProgramProto> proto(
         GpuProgramProto::default_instance().New());
     proto->set_sha(sha, kHashLength);
@@ -305,9 +282,7 @@ void MemoryProgramCache::SaveLinkedProgram(
     store_.Erase(store_.rbegin());
   }
 
-  if (!shader_callback.is_null() &&
-      !base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisableGpuShaderDiskCache)) {
+  if (!shader_callback.is_null() && !disable_gpu_shader_disk_cache_) {
     scoped_ptr<GpuProgramProto> proto(
         GpuProgramProto::default_instance().New());
     proto->set_sha(sha, kHashLength);