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

gpu/command_buffer/service/gpu_preferences.h

Index: gpu/command_buffer/service/gpu_preferences.h
diff --git a/gpu/command_buffer/service/gpu_preferences.h b/gpu/command_buffer/service/gpu_preferences.h
index 2721e272aab36002e4a51cefb66082097465f672..0c6a883979d0c3e7b5cb51f663789e9754fa85b4 100644
--- a/gpu/command_buffer/service/gpu_preferences.h
+++ b/gpu/command_buffer/service/gpu_preferences.h
@@ -66,10 +66,10 @@
   bool enforce_gl_minimums = false;
 
   // Sets the total amount of memory that may be allocated for GPU resources
-  uint32_t force_gpu_mem_available = 0;
+  size_t force_gpu_mem_available = 0;
 
   // Sets the maximum size of the in-memory gpu program cache, in kb
-  uint32_t gpu_program_cache_size = kDefaultMaxProgramCacheMemoryBytes;
+  size_t gpu_program_cache_size = kDefaultMaxProgramCacheMemoryBytes;
 
   // Disables the GPU shader on disk cache.
   bool disable_gpu_shader_disk_cache = false;