Add MB support for the windows analyze bot.

build/config/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.
 
 import("//build/config/allocator.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
@@ skipping 15 matching lines @@
   # default only in debug builds).
   #
   # Iterator debugging is generally useful for catching bugs. But it can
   # introduce extra locking to check the state of an iterator against the state
   # of the current object. For iterator- and thread-heavy code, this can
   # significantly slow execution.
   enable_iterator_debugging = true
 
   # Set to true to enable dcheck in Release builds.
   dcheck_always_on = false
+
+  # Normally we try to decide whether to use precompiled headers or
+  # not based on the other build arguments, but in some cases it is
+  # easiest to force them off explicitly.
+  disable_precompiled_headers = false
 }
 
 # TODO(brettw) Most of these should be removed. Instead of global feature
 # flags, we should have more modular flags that apply only to a target and its
 # dependents. For example, depending on the "x11" meta-target should define
 # USE_X11 for all dependents so that everything that could use X11 gets the
 # define, but anything that doesn't depend on X11 doesn't see it.
 #
 # For now we define these globally to match the current GYP build.
 config("feature_flags") {
@@ skipping 385 matching lines @@
 
 # Add this config to your target to enable precompiled headers.
 #
 # Precompiled headers are done on a per-target basis. If you have just a couple
 # of files, the time it takes to precompile (~2 seconds) can actually be longer
 # than the time saved. On a Z620, a 100 file target compiles about 2 seconds
 # faster with precompiled headers, with greater savings for larger targets.
 #
 # Recommend precompiled headers for targets with more than 50 .cc files.
 config("precompiled_headers") {
-  if (is_win && !is_official_build && !use_goma) {
-    # This is a string rather than a file GN knows about. It has to match
-    # exactly what's in the /FI flag below, and what might appear in the source
-    # code in quotes for an #include directive.
-    precompiled_header = "build/precompile.h"
+  if (!is_official_build && !use_goma && !disable_precompiled_headers) {
+    if (is_win) {
+      # This is a string rather than a file GN knows about. It has to match
+      # exactly what's in the /FI flag below, and what might appear in the
+      # source code in quotes for an #include directive.
+      precompiled_header = "build/precompile.h"
 
-    # This is a file that GN will compile with the above header. It will be
-    # implicitly added to the sources (potentially multiple times, with one
-    # variant for each language used in the target).
-    precompiled_source = "//build/precompile.cc"
+      # This is a file that GN will compile with the above header. It will be
+      # implicitly added to the sources (potentially multiple times, with one
+      # variant for each language used in the target).
+      precompiled_source = "//build/precompile.cc"
 
-    # Force include the header.
-    cflags = [ "/FI$precompiled_header" ]
+      # Force include the header.
+      cflags = [ "/FI$precompiled_header" ]
 
-    # Disable warning for "this file was empty after preprocessing". This
-    # error is generated only in C mode for ANSI compatibility. It conflicts
-    # with precompiled headers since the source file that's "compiled" for
-    # making the precompiled header is empty.
-    #
-    # This error doesn't happen every time. In VS2013, it seems if the .pch
-    # file doesn't exist, no error will be generated (probably MS tested this
-    # case but forgot the other one?). To reproduce this error, do a build,
-    # then delete the precompile.c.obj file, then build again.
-    cflags_c = [ "/wd4206" ]
-  } else if (is_mac && !is_official_build && !use_goma) {
-    precompiled_header = "build/precompile.h"
-    precompiled_source = "//build/precompile.h"
+      # Disable warning for "this file was empty after preprocessing". This
+      # error is generated only in C mode for ANSI compatibility. It conflicts
+      # with precompiled headers since the source file that's "compiled" for
+      # making the precompiled header is empty.
+      #
+      # This error doesn't happen every time. In VS2013, it seems if the .pch
+      # file doesn't exist, no error will be generated (probably MS tested this
+      # case but forgot the other one?). To reproduce this error, do a build,
+      # then delete the precompile.c.obj file, then build again.
+      cflags_c = [ "/wd4206" ]
+    } else if (is_mac) {
+      precompiled_header = "build/precompile.h"
+      precompiled_source = "//build/precompile.h"
+    }
   }
 }