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 15418bd4d6c19ff18acc9ac92456f2d216956c25..32aa0dcbd6b8d2d8b2d995ce62a20fc7494966f0 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -102,6 +102,7 @@ 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,
@@ -136,6 +137,7 @@ GpuCommandBufferStub::GpuCommandBufferStub(
   } else {
     context_group_ = new gpu::gles2::ContextGroup(
         mailbox_manager,
+        image_manager,
         new GpuCommandBufferMemoryTracker(channel),
         true);
   }