ozone: Enable vulkan by default (reland)

Vulkan is enabled by default on Linux desktop (X11) builds. Enable it on
ozone as well to make sure we have build coverage.

Fix chromium.memory/Linux Chromium OS ASan LSan Tests issue by breaking
unnecessary dependency on //gpu/vulkan/init.

Bug: 887110
Test: compile
Change-Id: I298704cf3b199c5c4ecf5173e137293650c5734a
Reviewed-on: https://chromium-review.googlesource.com/1235286
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592885}

components/viz/common/BUILD.gn

@@ -186,7 +186,7 @@ viz_component("common") {
       "gpu/vulkan_in_process_context_provider.h",
     ]
     configs = [ "//third_party/vulkan:vulkan_config" ]
-    deps += [ "//gpu/vulkan/init" ]
+    deps += [ "//gpu/vulkan" ]
   }
 
   if (is_win) {

components/viz/common/gpu/vulkan_in_process_context_provider.cc

@@ -4,7 +4,6 @@
 
 #include "components/viz/common/gpu/vulkan_in_process_context_provider.h"
 #include "gpu/vulkan/buildflags.h"
-#include "gpu/vulkan/init/vulkan_factory.h"
 #include "gpu/vulkan/vulkan_device_queue.h"
 #include "gpu/vulkan/vulkan_function_pointers.h"
 #include "gpu/vulkan/vulkan_implementation.h"

gpu/vulkan/features.gni

@@ -8,7 +8,7 @@ import("//build/config/ui.gni")
 # For details see declare_args() in build/config/BUILDCONFIG.gn.
 declare_args() {
   # Enable experimental vulkan backend.
-  enable_vulkan = (is_linux && use_x11) || is_android || is_fuchsia
+  enable_vulkan = is_linux || is_android || is_fuchsia
 
   # We want to temporarily disable Vulkan on Android to give us time to
   # investigate ways to reduce its binary size.

gpu/vulkan/init/vulkan_factory.cc

@@ -12,7 +12,7 @@
 #endif
 
 #if defined(USE_X11)
-#include "gpu/vulkan/x/vulkan_implementation_x11.h"
+#include "gpu/vulkan/x/vulkan_implementation_x11.h"  // nogncheck
 #endif
 
 #if defined(USE_OZONE)