gn: Add chromium_builder_asan target.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
 import("//media/media_options.gni")
 import("//third_party/openh264/openh264_args.gni")
+import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 declare_args() {
   # A list of extra dependencies to add to the root target. This allows a
   # checkout to add additional targets without explicitly changing any checked-
   # in files.
   root_extra_deps = []
@@ skipping 867 matching lines @@
       deps += [
         "//chrome/installer/mini_installer:mini_installer",
         "//third_party/angle/src/tests:angle_perftests",
       ]
     } else {
       deps += [ "//breakpad:minidump_stackwalk($host_toolchain)" ]
     }
   }
 }
 
+if (!is_ios && !is_android && !is_chromecast) {
+  group("chromium_builder_asan") {
+    deps = [
+      "//chrome:chrome",
+      "//content/shell:content_shell",
+      "//v8:d8",
+    ]
+    if (!is_win) {
+      deps += [
+        "//net:dns_fuzz_stub",
+        "//net:hpack_fuzz_wrapper",
+        "//skia:filter_fuzz_stub",
+      ]
+    }
+    if (enable_ipc_fuzzer && !is_component_build) {
+      deps += [ "//tools/ipc_fuzzer:ipc_fuzzer_all" ]
+    }
+    if (!is_chromeos && current_toolchain == host_toolchain) {

[Dirk Pranke, 2016/06/10 17:47:09]

When you just run `ninja chromium_builder_asan`, that is saying that you want to
build the group target using the default_toolchain (which is the target
toolchain). We don't magically merge all of the different versions of the target
in different toolchains and build all of them.

So, the way to say that you want a dependency to be built using the host
toolchain is:

if (!is_chromeos) {
  deps += [
    "//third_party/pdfium/samples:pdfium_test($host_toolchain)",
    "//v8:v8_shell($host_toolchain)",
  ]
}

[Nico, 2016/06/10 17:50:45]

Ah, thanks, done. (gn_all has the pattern I added here; guess that target wants
something else.)

[Dirk Pranke, 2016/06/10 17:55:03]

You mean gn_only, right? Yeah, that usage is almost certainly wrong for the same
reason (and I suspect I reviewed that change and didn't catch it at the time).

+      deps += [
+        "//third_party/pdfium/samples:pdfium_test",
+        "//v8:v8_shell",
+      ]
+    }
+    if (is_clang) {
+      deps += [ "//build/sanitizers:copy_llvm_symbolizer" ]
+    }
+    if (is_win && symbol_level == 2 && target_cpu == "x86" && is_syzyasan) {
+      deps += [
+        "//chrome/tools/build/win/syzygy:chrome_dll_syzygy",
+        # TODO(GYP): Add this once it exists, https://crbug.com/619086
+        # "//content/shell:content_shell_syzyasan
+      ]
+      if (is_multi_dll_chrome) {
+        deps += [ "//chrome/tools/build/win/syzygy:chrome_child_dll_syzygy" ]
+      }
+    }
+  }
+}
+
 # For compatibility with GYP. The linux_chromium_chromeos_rel_ng and
 # linux_chromium_chromeos_compile_rel_ng bots reference this target as
 # something to build, but all targets for those bots to compile are set
 # up differently.
 # TODO bug 601920: Remove reference to aura_builder on bot config and delete
 # this group.
 group("aura_builder") {
 }
 
 if (is_android) {
@@ skipping 32 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }