Make GrTextContext be owned by the GrDrawContext

src/core/SkDeviceProperties.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDeviceProperties_DEFINED
 #define SkDeviceProperties_DEFINED
 
 #include "SkSurfacePriv.h"
 
 struct SkDeviceProperties {
-    enum InitType {
-        kLegacyLCD_InitType
-    };
+    SkDeviceProperties(const SkDeviceProperties& src) 
+        : fGamma(src.fGamma)
+        , fPixelGeometry(src.fPixelGeometry) {
+    }
 
-    SkDeviceProperties(InitType, float gamma = SK_GAMMA_EXPONENT)
+    SkDeviceProperties(float gamma = SK_GAMMA_EXPONENT)
         : fGamma(gamma)
         , fPixelGeometry(SkSurfacePropsDefaultPixelGeometry())
     {}
 
     SkDeviceProperties(SkPixelGeometry geo, float gamma = SK_GAMMA_EXPONENT)
         : fGamma(gamma)
         , fPixelGeometry(geo)
     {}
 
+    float gamma() const { return fGamma; }
     SkPixelGeometry pixelGeometry() const { return fPixelGeometry; }
-    float gamma() const { return fGamma; }
 
     void setPixelGeometry(SkPixelGeometry geo) {
         fPixelGeometry = geo;
     }
 
 private:
-    const float   fGamma;
+    const float     fGamma;
     SkPixelGeometry fPixelGeometry;
 };
 
 #endif