gpu: Add support for GLX_EXT_texture_from_pixmap extension.

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index a15714650fb07ccc10b09ebf5c9351b9cd0c5d72..4a53fa18505522b7806574186e00c079a977aeaf 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -13,6 +13,7 @@
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
+#include "ui/gl/gl_image.h"
 
 namespace gpu {
 namespace gles2 {
@@ -122,6 +123,10 @@ class GPU_EXPORT TextureManager {
     bool GetLevelType(
         GLint face, GLint level, GLenum* type, GLenum* internal_format) const;
 
+    // Get the image bound to a particular level. Returns NULL if level
+    // does not exist.
+    scoped_refptr<gfx::GLImage> GetLevelImage(GLint face, GLint level) const;
+
     bool IsDeleted() const {
       return deleted_;
     }
@@ -211,9 +216,12 @@ class GPU_EXPORT TextureManager {
            border(rhs.border),
            format(rhs.format),
            type(rhs.type),
+           image(rhs.image),
            estimated_size(rhs.estimated_size) {
       }
 
+      ~LevelInfo() {}
+
       bool cleared;
       GLenum target;
       GLint level;
@@ -224,6 +232,7 @@ class GPU_EXPORT TextureManager {
       GLint border;
       GLenum format;
       GLenum type;
+      scoped_refptr<gfx::GLImage> image;
       uint32 estimated_size;
     };
 
@@ -289,6 +298,13 @@ class GPU_EXPORT TextureManager {
     // Update info about this texture.
     void Update(const FeatureInfo* feature_info);
 
+    // Set the image for a particular level.
+    void SetLevelImage(
+        const FeatureInfo* feature_info,
+        GLenum target,
+        GLint level,
+        scoped_refptr<gfx::GLImage> image);
+
     // Info about each face and level of texture.
     std::vector<std::vector<LevelInfo> > level_infos_;
 
@@ -513,6 +529,12 @@ class GPU_EXPORT TextureManager {
     return mem_represented_;
   }
 
+  void SetLevelImage(
+      TextureInfo* info,
+      GLenum target,
+      GLint level,
+      scoped_refptr<gfx::GLImage> image);
+
  private:
   // Helper for Initialize().
   TextureInfo::Ref CreateDefaultAndBlackTextures(