Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 1f5e2ce..566ae54 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -213,25 +213,25 @@
 
     GrTexture* onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle lifeCycle,
                                const void* srcData, size_t rowBytes) override {
-        return NULL;
+        return nullptr;
     }
 
     GrTexture* onCreateCompressedTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle,
                                          const void* srcData) override {
-        return NULL;
+        return nullptr;
     }
 
     GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&,
-                                    GrWrapOwnership) override { return NULL; }
+                                    GrWrapOwnership) override { return nullptr; }
 
     GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                               GrWrapOwnership) override {
-        return NULL;
+        return nullptr;
     }
 
-    GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) override { return NULL; }
+    GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) override { return nullptr; }
 
-    GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) override { return NULL; }
+    GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) override { return nullptr; }
 
     void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) override {}
 
@@ -290,7 +290,7 @@
 void GrContext::initMockContext() {
     GrContextOptions options;
     options.fGeometryBufferMapThreshold = 0;
-    SkASSERT(NULL == fGpu);
+    SkASSERT(nullptr == fGpu);
     fGpu = new MockGpu(this, options);
     SkASSERT(fGpu);
     this->initCommon();