Check all scratch texture allocations for image filters.

src/effects/SkMorphologyImageFilter.cpp

Index: src/effects/SkMorphologyImageFilter.cpp
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index 49df654316d8637b15e14397e270151875492f2a..67769f29b93c2efe2468071133ec7ceb7212e0ca 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -506,6 +506,9 @@ bool apply_morphology(const SkBitmap& input,
 
     if (radius.fWidth > 0) {
         GrAutoScratchTexture ast(context, desc);
+        if (NULL == ast.texture()) {
+            return false;
+        }
         GrContext::AutoRenderTarget art(context, ast.texture()->asRenderTarget());
         apply_morphology_pass(context, src, srcRect, dstRect, radius.fWidth,
                               morphType, Gr1DKernelEffect::kX_Direction);
@@ -519,6 +522,9 @@ bool apply_morphology(const SkBitmap& input,
     }
     if (radius.fHeight > 0) {
         GrAutoScratchTexture ast(context, desc);
+        if (NULL == ast.texture()) {
+            return false;
+        }
         GrContext::AutoRenderTarget art(context, ast.texture()->asRenderTarget());
         apply_morphology_pass(context, src, srcRect, dstRect, radius.fHeight,
                               morphType, Gr1DKernelEffect::kY_Direction);