Fixed tough texture upload benchmark on low end devices.

gpu/command_buffer/client/gles2_implementation.h

Index: gpu/command_buffer/client/gles2_implementation.h
diff --git a/gpu/command_buffer/client/gles2_implementation.h b/gpu/command_buffer/client/gles2_implementation.h
index 7f036db908c6327eef9dc5b364a6a28353e5f7df..dca1483eebb059b7896eeaa83c7ec3e7e515f103 100644
--- a/gpu/command_buffer/client/gles2_implementation.h
+++ b/gpu/command_buffer/client/gles2_implementation.h
@@ -746,6 +746,11 @@ class GLES2_IMPL_EXPORT GLES2Implementation
   // Used to check for single threaded access.
   int use_count_;
 
+  // Maximum amount of extra shared memory to use when needing to transfer

[no sievers, 2015/10/19 15:55:04]

nit: maybe say 'extra memory from the mapped memory pool', since it's
technically not entirely 'extra' but part of an existing pool

[David Yen, 2015/10/19 16:02:18]

Done.

+  // something exceeding the default transfer buffer. This should be 0 for
+  // low memory devices since they are already memory constrained.
+  const uint32_t max_extra_transfer_buffer_size_;
+
   // Map of GLenum to Strings for glGetString.  We need to cache these because
   // the pointer passed back to the client has to remain valid for eternity.
   typedef std::map<uint32, std::set<std::string> > GLStringMap;