ozone/wayland: Change the way how we link with wayland-egl/client.

We used to be linking with system provided libwayland-egl,
but it's not suitable for our script that controls required packages.

The thing is that libwayland-egl1 is available on Debian => 9
and Ubuntu >= 16. On older versions (Trusty and Jessie),
libwayland-egl0 is available. We don't support different packages
for different versions. Thus, use the wayland-egl from
the //third_party.

And there is also another problem with libwayland-client. When
we statically link with the library from
//third_party/wayland:wayland_client, libffi dependency is also added.
However, Ubuntu 20 names this package libffi7, while older versions
name that as libffi6. Thus, to avoid this problem, link with
that package differently through libs = [ "wayland-client" ].

Bug: 1116384
Change-Id: I76f7205db0d6425e92bd66c7b1981d525f49d2e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355944Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#798772}

third_party/wayland/BUILD.gn

@@ -19,9 +19,9 @@ if (!use_system_libwayland) {
 
   static_library("wayland_util") {
     sources = [
+      "src/src/wayland-private.h",
       "src/src/wayland-util.c",
       "src/src/wayland-util.h",
-      "src/src/wayland-private.h",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
@@ -102,6 +102,22 @@ if (!use_system_libwayland) {
     public_configs = [ ":wayland_config" ]
   }
 
+  static_library("wayland_egl") {
+    sources = [
+      "src/egl/wayland-egl-backend.h",
+      "src/egl/wayland-egl-core.h",
+      "src/egl/wayland-egl.c",
+      "src/egl/wayland-egl.h",
+    ]
+
+    deps = [ ":wayland_util" ]
+
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+
+    public_configs = [ ":wayland_config" ]
+  }
+
   config("wayland_scanner_config") {
     cflags = [
       "-Wno-int-conversion",
@@ -137,6 +153,10 @@ if (use_system_libwayland) {
     packages = [ "wayland-server" ]
   }
 
+  pkg_config("wayland_egl_config") {
+    packages = [ "wayland-egl" ]
+  }
+
   group("wayland_client") {
     public_configs = [ ":wayland_client_config" ]
   }
@@ -148,4 +168,8 @@ if (use_system_libwayland) {
   group("wayland_util") {
     public_configs = [ ":wayland_client_config" ]
   }
+
+  group("wayland_egl") {
+    public_configs = [ ":wayland_egl_config" ]
+  }
 }

ui/ozone/platform/wayland/BUILD.gn

@@ -10,10 +10,6 @@ import("//gpu/vulkan/features.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//ui/ozone/platform/wayland/wayland.gni")
 
-pkg_config("wayland-egl") {
-  packages = [ "wayland-egl" ]
-}
-
 source_set("wayland") {
   sources = [
     "client_native_pixmap_factory_wayland.cc",
@@ -150,7 +146,7 @@ source_set("wayland") {
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//skia",
-    "//third_party/wayland:wayland_client",
+    "//third_party/wayland:wayland_egl",
     "//third_party/wayland-protocols:gtk_primary_selection_protocol",
     "//third_party/wayland-protocols:keyboard_extension_protocol",
     "//third_party/wayland-protocols:linux_dmabuf_protocol",
@@ -182,6 +178,18 @@ source_set("wayland") {
     "//ui/platform_window/wm",
   ]
 
+  # TODO(msisov): we should do the following once support for Trusty and Jessie
+  # are dropped:
+  # 1. Remove libs=["wayland-client"] and
+  # add deps+=["//third_party/wayland:wayland_client"]
+  # 2. Set use_system_libwayland=true for is_desktop_linux.
+  libs = []
+  if (!is_chromeos) {
+    libs = [ "wayland-client" ]
+  } else {
+    deps += [ "//third_party/wayland:wayland_client" ]
+  }
+
   if (is_linux && !is_chromeos) {
     deps += [ "//ui/base/ime/linux" ]
   }
@@ -229,10 +237,7 @@ source_set("wayland") {
     deps += [ "//gpu/vulkan" ]
   }
 
-  configs += [
-    ":wayland-egl",
-    "//third_party/khronos:khronos_headers",
-  ]
+  configs += [ "//third_party/khronos:khronos_headers" ]
 }
 
 source_set("test_support") {