Don't allow nullptr in texels array params (unless using a transfer buffer).

src/gpu/GrTextureProvider.cpp

Index: src/gpu/GrTextureProvider.cpp
diff --git a/src/gpu/GrTextureProvider.cpp b/src/gpu/GrTextureProvider.cpp
index 2d422f717f5e777ff8af2c2dc486465b963a47e9..fef9ed4d7dd8d6a2f3b1bccbf2d635522d2ed205 100644
--- a/src/gpu/GrTextureProvider.cpp
+++ b/src/gpu/GrTextureProvider.cpp
@@ -37,6 +37,15 @@ GrTexture* GrTextureProvider::createMipMappedTexture(const GrSurfaceDesc& desc,
     if (this->isAbandoned()) {
         return nullptr;
     }
+    if (mipLevelCount && !texels) {
+        return nullptr;
+    }
+    for (int i = 0; i < mipLevelCount; ++i) {
+        if (!texels[i].fPixels) {
+            return nullptr;
+        }
+    }
+
     if ((desc.fFlags & kRenderTarget_GrSurfaceFlag) &&
         !fGpu->caps()->isConfigRenderable(desc.fConfig, desc.fSampleCnt > 0)) {
         return nullptr;
@@ -48,8 +57,8 @@ GrTexture* GrTextureProvider::createMipMappedTexture(const GrSurfaceDesc& desc,
             static const uint32_t kFlags = kExact_ScratchTextureFlag |
                                            kNoCreate_ScratchTextureFlag;
             if (GrTexture* texture = this->refScratchTexture(desc, kFlags)) {
-                if (texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
-                                         baseMipLevel.fPixels, baseMipLevel.fRowBytes)) {
+                if (!texels || texture->writePixels(0, 0, desc.fWidth, desc.fHeight, desc.fConfig,
+                                                    baseMipLevel.fPixels, baseMipLevel.fRowBytes)) {
                     if (SkBudgeted::kNo == budgeted) {
                         texture->resourcePriv().makeUnbudgeted();
                     }
@@ -69,12 +78,13 @@ GrTexture* GrTextureProvider::createMipMappedTexture(const GrSurfaceDesc& desc,
 
 GrTexture* GrTextureProvider::createTexture(const GrSurfaceDesc& desc, SkBudgeted budgeted,
                                             const void* srcData, size_t rowBytes) {
-    const int mipLevelCount = 1;
-    GrMipLevel texels[mipLevelCount];
-    texels[0].fPixels = srcData;
-    texels[0].fRowBytes = rowBytes;
-
-    return this->createMipMappedTexture(desc, budgeted, texels, mipLevelCount);
+    if (srcData) {
+        GrMipLevel texels;
+        texels.fPixels = srcData;
+        texels.fRowBytes = rowBytes;
+        return this->createMipMappedTexture(desc, budgeted, &texels, 1);
+    }
+    return this->createMipMappedTexture(desc, budgeted, nullptr, 0);
 }
 
 GrTexture* GrTextureProvider::createApproxTexture(const GrSurfaceDesc& desc) {