Make GLES2Implementation use a larger chunk size for mapping functions.

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 9a9cd85b411fd3ae1b41df80ee972cdf50e2223d..12238dad5fd0825eed281e4adc58a48509cf3c14 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -562,6 +562,7 @@ GLES2Implementation::GLES2Implementation(
   memset(&reserved_ids_, 0, sizeof(reserved_ids_));
 
   mapped_memory_.reset(new MappedMemoryManager(helper_));
+  SetSharedMemoryChunkSizeMultiple(1024 * 1024 * 2);
 
   if (share_resources) {
     if (!bind_generates_resource) {
@@ -641,6 +642,11 @@ GLES2Implementation::~GLES2Implementation() {
 #endif
 }
 
+void GLES2Implementation::SetSharedMemoryChunkSizeMultiple(
+    unsigned int multiple) {
+  mapped_memory_->set_chunk_size_multiple(multiple);
+}
+
 void GLES2Implementation::FreeUnusedSharedMemory() {
   mapped_memory_->FreeUnused();
 }