Use a struct for client GL texture handles

src/gpu/gl/GrGLTexture.h

Index: src/gpu/gl/GrGLTexture.h
diff --git a/src/gpu/gl/GrGLTexture.h b/src/gpu/gl/GrGLTexture.h
index 40a68eb9e901e292d329745d504d612faf9cc468..8366a8dab06c9b4e58eef0d73f9c3e3ba9f71b54 100644
--- a/src/gpu/gl/GrGLTexture.h
+++ b/src/gpu/gl/GrGLTexture.h
@@ -28,8 +28,7 @@ public:
     };
 
     struct IDDesc {
-        GrGLenum                    fTarget;
-        GrGLuint                    fTextureID;
+        GrGLTextureInfo             fInfo;
         GrGpuResource::LifeCycle    fLifeCycle;
     };
 
@@ -51,9 +50,9 @@ public:
         fTexParamsTimestamp = timestamp;
     }
 
-    GrGLuint textureID() const { return fTextureID; }
+    GrGLuint textureID() const { return fInfo.fID; }
 
-    GrGLenum target() const { return fTarget; }
+    GrGLenum target() const { return fInfo.fTarget; }
 
 protected:
     // The public constructor registers this object with the cache. However, only the most derived
@@ -72,8 +71,9 @@ protected:
 private:
     TexParams                       fTexParams;
     GrGpu::ResetTimestamp           fTexParamsTimestamp;
-    GrGLenum                        fTarget;
-    GrGLuint                        fTextureID;
+    // Holds the texture target and ID. A pointer to this may be shared to external clients for
+    // direct interaction with the GL object.
+    GrGLTextureInfo                 fInfo;
 
     // We track this separately from GrGpuResource because this may be both a texture and a render
     // target, and the texture may be wrapped while the render target is not.