gpu: Add support for GLX_EXT_texture_from_pixmap extension.

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index 2de52e9ece00eb16f0d2c367812c45309115829a..b9632a8420cc748ddad32c042af368d3dcaa5165 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -100,6 +100,7 @@ GpuCommandBufferStub::GpuCommandBufferStub(
     GpuCommandBufferStub* share_group,
     const gfx::GLSurfaceHandle& handle,
     gpu::gles2::MailboxManager* mailbox_manager,
+    gpu::gles2::ImageManager* image_manager,
     const gfx::Size& size,
     const gpu::gles2::DisallowedFeatures& disallowed_features,
     const std::string& allowed_extensions,
@@ -134,6 +135,7 @@ GpuCommandBufferStub::GpuCommandBufferStub(
   } else {
     context_group_ = new gpu::gles2::ContextGroup(
         mailbox_manager,
+        image_manager,
         new GpuCommandBufferMemoryTracker(channel),
         true);
   }