Insert a soft flush into the command buffer on unmapTexSubImage2D

This does a CommandBufferHelper flush in UnmapTexSubImage2DCHROMIUM so the gpu process can start
processing texture uploads as soon as the texture is unmapped instead of waiting until the next
hard flush or finish. This increase parallelization for tile uploads, especially during compositor
startup and when the entire root layer is damaged.

On my linux z600, this cuts down on the time taken to initially composite the poster circle page
measured from start of RenderWidget::DoDeferredUpdate to the first SwapBuffers completing from
100ms->50ms

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7492060

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@94504 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2 insertions, 0 deletions

diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index b11554a..a0f3dd3 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -2155,6 +2155,7 @@ void GLES2Implementation::UnmapBufferSubDataCHROMIUM(const void* mem) {
   helper_->BufferSubData(
       mb.target, mb.offset, mb.size, mb.shm_id, mb.shm_offset);
   mapped_memory_->FreePendingToken(mb.shm_memory, helper_->InsertToken());
+  helper_->CommandBufferHelper::Flush();
   mapped_buffers_.erase(it);
 }
 
@@ -2225,6 +2226,7 @@ void GLES2Implementation::UnmapTexSubImage2DCHROMIUM(const void* mem) {
       mt.target, mt.level, mt.xoffset, mt.yoffset, mt.width, mt.height,
       mt.format, mt.type, mt.shm_id, mt.shm_offset, GL_FALSE);
   mapped_memory_->FreePendingToken(mt.shm_memory, helper_->InsertToken());
+  helper_->CommandBufferHelper::Flush();
   mapped_textures_.erase(it);
 }