import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1221716 - Part 1: Make the simpler parts of BytecodeEmitter::emitTree() use the `ok` boolean consistently. r=Waldo. (8b2eae4dcf)
- Bug 1221716 - Part 2: Factor out all remaining complex cases from the switch statement in emitTree(). r=Waldo. (805c9a96da)
- Bug 1221737 - Drop some BytecodeEmitter checks for cases that the Parser rules out. r=jonco. (9726a6527b)
- Bug 1224460 - Use pwd -W to fill _topsrcdir in configure. r=gps (cc7bf71652)
- Bug 1221737 followup - Bump XDR_BYTECODE_VERSION_SUBTRAHEND to fix build errors on a CLOSED TREE. r=bustage (d2d2f41a14)
- Bug 1170913, full-update target in tools/update-packaging/ always runs automation-partial-patch, r=glandium DONTBUILD (12e5e212d8)
- Bug 1137756 - Use absolute paths in complete-patch.patch. r=gps (62fc37688b)
- Bug 1173998 - use localized package for previous mar; r=nthomas (fb6c95955c)
- Bug 1173459 - Stop generating partial MAR files and publishing complete MARs to balrog as a part of nightly automation. r=mshal (4c427b9f7f)
- Bug 1164580 - Preprocess ua-update.json via slashslash filter. r=fabrice (d934f84f15)
- Bug 1200021 - Part 2: more diagnostics. r=bas (e1cfecbbd4)
- Bug 1200021 - crash in mozilla::layers::ContentClientDoubleBuffered::FinalizeFrame(nsIntRegion const&): Diagnostics to get more data. r=bas (d782b24501)
- Bug 1222569 - fix initialization order in DataTextureSourceD3D9; r=Bas (028939600b)
- Bug 1209801 - Part 1: Add TextureFlags parameter to TextureClientPool. r=mattwoodrow (c5b73613f9)
- Bug 1209801 - Part 2: Do not allow big image textures to be used with TiledLayerBuffers. r=mattwoodrow (cb553ccdea)
- Bug 1211615: Upload the full texture on the first upload for component alpha textures. r=nical (3bd6688679)
- minor (928a95b259)
- Bug 1222569 - remove unused variable in TextureD3D9.cpp; r=Bas (ac5a86be1c)
- Bug 1223928 - Make the horizontal scrollbar on the root scrollable shift correctly with the dynamic toolbar. r=botond (6c6c0b8c24)
- Bug 1216349: Upload the old valid region as well if our texture host changed. r=nical (7d4d041bd2)
- Bug 1236227, don't OOM in TextDecoder, r=baku (9bef90eada)
- Bug 1218594 - r=smaug (de39570c72)
- remove include (62e582fe3d)
- Bug 1226176 - Compute retained sizes in dominator trees and expose them to JavaScript; r=bz,sfink (92bb08a674)

gfx/layers/ImageDataSerializer.cpp

@@ -154,9 +154,13 @@ already_AddRefed<DrawTarget>
 ImageDataSerializerBase::GetAsDrawTarget(gfx::BackendType aBackend)
 {
   MOZ_ASSERT(IsValid());
-  return gfx::Factory::CreateDrawTargetForData(aBackend,
+  RefPtr<DrawTarget> dt = gfx::Factory::CreateDrawTargetForData(aBackend,
                                                GetData(), GetSize(),
                                                GetStride(), GetFormat());
+  if (!dt) {
+    gfxCriticalNote << "Failed GetAsDrawTarget " << IsValid() << ", " << hexa(size_t(mData)) << " + " << SurfaceBufferInfo::GetOffset() << ", " << GetSize() << ", " << GetStride() << ", " << (int)GetFormat();
+  }
+  return dt.forget();
 }
 
 already_AddRefed<gfx::DataSourceSurface>