Disable automatic flushes on compositor contexts.

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.cc b/gpu/command_buffer/client/cmd_buffer_helper.cc
index d556b5e7773b2d82d1434b8eac5985d2f69326d8..54df89ed3da91ed5fb2997498111e9d25333e827 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper.cc
@@ -28,9 +28,14 @@ CommandBufferHelper::CommandBufferHelper(CommandBuffer* command_buffer)
       commands_issued_(0),
       usable_(true),
       context_lost_(false),
+      flush_automatically_(true),
       last_flush_time_(0) {
 }
 
+void CommandBufferHelper::SetAutomaticFlushes(bool enabled) {
+  flush_automatically_ = enabled;
+}
+
 bool CommandBufferHelper::IsContextLost() {
   if (!context_lost_) {
     context_lost_ = error::IsError(command_buffer()->GetLastError());
@@ -241,8 +246,9 @@ void CommandBufferHelper::WaitForAvailableEntries(int32 count) {
       ((get_offset() == last_put_sent_) ? 16 : 2);
   if (pending > limit) {
     Flush();
-  } else if (commands_issued_ % kCommandsPerFlushCheck == 0) {
-#if !defined(OS_ANDROID) && !defined(OS_CHROMEOS)
+  } else if (flush_automatically_ &&
+             (commands_issued_ % kCommandsPerFlushCheck == 0)) {
+#if !defined(OS_ANDROID)
     // Allow this command buffer to be pre-empted by another if a "reasonable"
     // amount of work has been done. On highend machines, this reduces the
     // latency of GPU commands. However, on Android, this can cause the