Allow startup with missing V8 snapshot file.

components/html_viewer/setup.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/html_viewer/setup.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/logging.h"
@@ skipping 90 matching lines @@
     app_->Terminate();
     return;
   }
 
   ui_setup_.reset(new UISetup(screen_size_in_pixels, device_pixel_ratio));
   base::DiscardableMemoryAllocator::SetInstance(&discardable_memory_allocator_);
 
   renderer_scheduler_ = scheduler::RendererScheduler::Create();
   blink_platform_.reset(new BlinkPlatformImpl(app_, renderer_scheduler_.get()));
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
-  CHECK(gin::V8Initializer::LoadV8SnapshotFromFD(
+  gin::V8Initializer::LoadV8SnapshotFromFD(
+      resource_loader_.ReleaseFile(kResourceSnapshotBlob).TakePlatformFile(),
+      0u, 0u);
+  gin::V8Initializer::LoadV8NativesFromFD(
       resource_loader_.ReleaseFile(kResourceNativesBlob).TakePlatformFile(), 0u,
-      0u,
-      resource_loader_.ReleaseFile(kResourceSnapshotBlob).TakePlatformFile(),
-      0u, 0u));
+      0u);
 #endif
   blink::initialize(blink_platform_.get());
   base::i18n::InitializeICUWithFileDescriptor(
       resource_loader_.ReleaseFile(kResourceIcudtl).TakePlatformFile(),
       base::MemoryMappedFile::Region::kWholeFile);
 
   ui::RegisterPathProvider();
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
@@ skipping 22 matching lines @@
 #else
   bool enable_mojo_media_renderer =
       command_line->HasSwitch(kEnableMojoMediaRenderer);
 
   web_media_player_factory_.reset(new WebMediaPlayerFactory(
       compositor_thread_.message_loop_proxy(), enable_mojo_media_renderer));
 #endif
 }
 
 }  // namespace html_viewer