Image filters: Replace all use of tryAllocPixels() with createDevice().

src/effects/SkDisplacementMapEffect.cpp

Index: src/effects/SkDisplacementMapEffect.cpp
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 4be8d7735184e11319e933e4cc8f867f38c2286a..387877941d362d66ebd9c3c4d9ba61719f63f90f 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkDisplacementMapEffect.h"
+#include "SkDevice.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkUnPreMultiply.h"
@@ -239,9 +240,12 @@ bool SkDisplacementMapEffect::onFilterImage(Proxy* proxy,
         return false;
     }
 
-    if (!dst->tryAllocPixels(color.info().makeWH(bounds.width(), bounds.height()))) {
+    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
+    if (!device) {
         return false;
     }
+    *dst = device->accessBitmap(false);
+    SkAutoLockPixels alp_dst(*dst);
 
     SkVector scale = SkVector::Make(fScale, fScale);
     ctx.ctm().mapVectors(&scale, 1);