Get rid of gpu related switches by passing gpu::GpuPreferences via IPC.

gpu/command_buffer/service/gpu_preferences.h

 // Copyright 2016 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 48 matching lines @@
   // Enable GPU service logging.
   bool enable_gpu_service_logging_gpu = false;
 
   // Turn off gpu program caching
   bool disable_gpu_program_cache = false;
 
   // Enforce GL minimums.
   bool enforce_gl_minimums = false;
 
   // Sets the total amount of memory that may be allocated for GPU resources
-  size_t force_gpu_mem_available = 0;
+  unsigned int force_gpu_mem_available = 0;
 
   // Sets the maximum size of the in-memory gpu program cache, in kb
-  size_t gpu_program_cache_size = kDefaultMaxProgramCacheMemoryBytes;
+  unsigned int gpu_program_cache_size = kDefaultMaxProgramCacheMemoryBytes;
 
   // Disables the GPU shader on disk cache.
   bool disable_gpu_shader_disk_cache = false;
 
   // Allows async texture uploads (off main thread) via GL context sharing.
   bool enable_share_group_async_texture_upload = false;
 
   // Enable WebGL subscribe uniform extension.
   bool enable_subscribe_uniform_extension = false;
 
@@ skipping 18 matching lines @@
   // Turns on calling TRACE for every GL call.
   bool enable_gpu_service_tracing = false;
 
   // Enable OpenGL ES 3 APIs without proper service side validation.
   bool enable_unsafe_es3_apis = false;
 };
 
 }  // namespace gpu
 
 #endif // GPU_COMMAND_BUFFER_SERVICE_GPU_PREFERENCES_H_