Fix leak of GrGLTexID when its owning GrGLTexture has been abandoned.

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 79cea08663075ead9686497426fde6018dd8a00d..025faded72a0a1213c433785c43e6ed4d7fca38c 100644
--- a/src/gpu/gl/GrGLTexture.h
+++ b/src/gpu/gl/GrGLTexture.h
@@ -70,27 +70,27 @@ public:
     GrGLTexture(GrGpuGL* gpu,
                 const Desc& textureDesc);
 
-
     virtual ~GrGLTexture() { this->release(); }
 
     virtual GrBackendObject getTextureHandle() const SK_OVERRIDE;
 
     virtual void invalidateCachedState() SK_OVERRIDE { fTexParams.invalidate(); }
 
-    // these functions
+    // These functions are used to track the texture parameters associated with the texture.
     const TexParams& getCachedTexParams(GrGpu::ResetTimestamp* timestamp) const {
         *timestamp = fTexParamsTimestamp;
         return fTexParams;
     }
+
     void setCachedTexParams(const TexParams& texParams,
                             GrGpu::ResetTimestamp timestamp) {
         fTexParams = texParams;
         fTexParamsTimestamp = timestamp;
     }
-    GrGLuint textureID() const { return fTexIDObj->id(); }
 
-protected:
+    GrGLuint textureID() const { return (NULL != fTexIDObj.get()) ? fTexIDObj->id() : 0; }
 
+protected:
     // overrides of GrTexture
     virtual void onAbandon() SK_OVERRIDE;
     virtual void onRelease() SK_OVERRIDE;
@@ -98,7 +98,7 @@ protected:
 private:
     TexParams                       fTexParams;
     GrGpu::ResetTimestamp           fTexParamsTimestamp;
-    GrGLTexID*                      fTexIDObj;
+    SkAutoTUnref<GrGLTexID>         fTexIDObj;
 
     void init(GrGpuGL* gpu,
               const Desc& textureDesc,