This is specifically in the context of gpu::Capabilities::texture_half_float_linear, but it may apply to other features.

The gpu::Capabilities::texture_half_float_linear property is
- based on FeatureFlags::enable_texture_half_float_linear
- populated in GLES2DecoderImpl::GetCapabilities
- called by GpuChannel::OnCreateCommandBuffer in the GPU process
- cached on the client side in GLES2Implementation::GLES2Implementation
- and never updated

This is problematic because FeatureFlags::enable_texture_half_float_linear is dynamic and be updated by requesting the GL_OES_texture_half_float_linear extension, while the client-side property is static.

This causes us to blow up when creating a half-float GpuMemoryBuffers because we check capabilities.texture_half_float_linear in IsImageFromGpuMemoryBufferFormatSupported, and will report false.

The GpuMemoryBuffer problem can be worked around by using asynchronous GMB creation (which is probably preferable), but this is probably worth knowing about.

A reasonable solution would be to have RequestExtensionChromium update the calling client's gpu::Capabilities.