Allow GrGLEffects to produce variable length keys.

include/gpu/GrEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrEffect_DEFINED
 #define GrEffect_DEFINED
 
@@ skipping 53 matching lines @@
         ...
         };
      */
     virtual const GrBackendEffectFactory& getFactory() const = 0;
 
     /** Returns true if this and other effect conservatively draw identically. It can only return
         true when the two effects are of the same subclass (i.e. they return the same object from
         from getFactory()).
 
         A return value of true from isEqual() should not be used to test whether the effects would
-        generate the same shader code. To test for identical code generation use the EffectKey
-        computed by the GrBackendEffectFactory:
-            effectA.getFactory().glEffectKey(effectA) == effectB.getFactory().glEffectKey(effectB).
+        generate the same shader code. To test for identical code generation use the effects' keys
+        computed by the GrBackendEffectFactory.
      */
     bool isEqual(const GrEffect& other) const {
         if (&this->getFactory() != &other.getFactory()) {
             return false;
         }
         bool result = this->onIsEqual(other);
 #ifdef SK_DEBUG
         if (result) {
             this->assertEquality(other);
         }
@@ skipping 135 matching lines @@
  * This creates an effect outside of the effect memory pool. The effect's destructor will be called
  * at global destruction time. NAME will be the name of the created GrEffect.
  */
 #define GR_CREATE_STATIC_EFFECT(NAME, EFFECT_CLASS, ARGS)                                         \
 static SkAlignedSStorage<sizeof(EFFECT_CLASS)> g_##NAME##_Storage;                                \
 static GrEffect* NAME SkNEW_PLACEMENT_ARGS(g_##NAME##_Storage.get(), EFFECT_CLASS, ARGS);         \
 static SkAutoTDestroy<GrEffect> NAME##_ad(NAME);
 
 
 #endif