Add f suffix to 0.5 to fix mac 10.6 warning

src/gpu/effects/GrRRectEffect.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrRRectEffect.h"
 
 #include "gl/GrGLEffect.h"
 #include "gl/GrGLSL.h"
 #include "GrTBackendEffectFactory.h"
 
 #include "SkPath.h"
 
 // This effect only supports circular corner rrects where all corners have the same radius
 // which must be <= kRadiusMin.
-static const SkScalar kRadiusMin = 0.5;
+static const SkScalar kRadiusMin = 0.5f;
 
 //////////////////////////////////////////////////////////////////////////////
 class GrGLRRectEffect : public GrGLEffect {
 public:
     GrGLRRectEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
 
     virtual void emitCode(GrGLShaderBuilder* builder,
                           const GrDrawEffect& drawEffect,
                           EffectKey key,
                           const char* outputColor,
@@ skipping 117 matching lines @@
                                        const GrDrawTargetCaps& caps,
                                        GrTexture*[]) {
     SkScalar w = random->nextRangeScalar(20.f, 1000.f);
     SkScalar h = random->nextRangeScalar(20.f, 1000.f);
     SkScalar r = random->nextRangeF(kRadiusMin, 9.f);
     SkRRect rrect;
     rrect.setRectXY(SkRect::MakeWH(w, h), r, r);
 
     return GrRRectEffect::Create(rrect);
 }