Add angle_link_glx arg to standalone gn build.

Port the angle_link_glx setting of the gyp build to the standalone gn build. When set to true, libGL will be linked into libANGLE, instead of dlopen-ed. This is useful when using apitrace. BUG=angleproject:1569 Change-Id: I16a91504960169efdcde3b2c50b944de148d9ba6 Reviewed-on: https://chromium-review.googlesource.com/821691Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Frank Henigman <fjhenigman@chromium.org>

Add angle_link_glx arg to standalone gn build.
e42ec189 · Frank Henigman · Commit Bot · 9fc87331 · e42ec189
Commit e42ec189 authored Dec 11, 2017 by Frank Henigman Committed by Commit Bot Dec 15, 2017
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--- a/BUILD.gn
+++ b/BUILD.gn
@@ -13,6 +13,9 @@ declare_args() {
  # Use the PCI lib to collect GPU information on Linux.
  use_libpci = is_linux && (!is_chromecast || is_cast_desktop_build) &&
               (use_x11 || use_ozone)
+
+  # Link in system libGL, to work with apitrace.  See doc/DebuggingTips.md.
+  angle_link_glx = false
 }

 if (!build_with_chromium) {
@@ -409,6 +412,10 @@ static_library("libANGLE") {
  include_dirs = []
  libs = []
  defines = []
+  if (angle_link_glx) {
+    libs += [ "GL" ]
+    defines += [ "ANGLE_LINK_GLX" ]
+  }
  public_deps = [
    ":angle_common",
  ]