Use precompiled headers for most large projects.

build/precompile.h

Index: build/precompile.h
diff --git a/build/precompile.h b/build/precompile.h
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+// Copyright (c) 2011 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.
+
+// Precompiled header for Chromium project on Windows, not used by
+// other build configurations. Using precompiled headers speeds the
+// build up significantly, around 1/4th on VS 2010 on an HP Z600 with 12
+// GB of memory.
+//
+// Numeric comments beside includes are the number of times they were
+// included under src/chrome/browser on 2011/8/20, which was used as a
+// baseline for deciding what to include in the PCH. It may be
+// possible to tweak the speed of the build by commenting out or
+// removing some of the less frequently used headers.
+
+#if defined(BUILD_PRECOMPILE_H_)
+#error You shouldn't include the precompiled header file more than once.
+#endif
+
+#define BUILD_PRECOMPILE_H_
+
+// The Windows header needs to come before almost all the other
+// Windows-specific headers.
+#include <Windows.h>
+
+// TODO(joi): Defines in atlbase.h cause conflicts; need to figure out
+// if/how this family of headers can be included in the PCH; several
+// of them are used quite frequently.
+/*
+#include <atlbase.h>
+#include <atlapp.h>
+#include <atlcom.h>
+#include <atlcrack.h>  // 2
+#include <atlctrls.h>  // 2
+#include <atlmisc.h>  // 2
+#include <atlsafe.h>  // 1
+#include <atltheme.h>  // 1
+#include <atlwin.h>  // 2
+*/
+
+#include <commctrl.h>  // 2
+#include <commdlg.h>  // 3
+#include <cryptuiapi.h>  // 2
+#include <dwmapi.h>
+#include <Objbase.h>  // 2
+#include <objidl.h>  // 1
+#include <ole2.h>  // 1
+#include <oleacc.h>  // 2
+#include <oleauto.h>  // 1
+#include <oleidl.h>  // 1
+#include <propkey.h>  // 2
+#include <propvarutil.h>  // 2
+#include <pstore.h>  // 2
+#include <shellapi.h>
+#include <shlguid.h>  // 1
+//#include <shlobj.h>  TODO(joi): Caused conflicts, see if they can be resolved.
+#include <shlwapi.h>  // 1
+#include <shobjidl.h>  // 4
+#include <urlhist.h>  // 2
+#include <wincrypt.h>  // 4
+#include <wtypes.h>  // 2
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>  // 4
+#include <math.h>
+#include <memory.h>  // 1
+#include <signal.h>
+#include <stdarg.h>  // 1
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>  // 4
+
+#include <algorithm>
+#include <bitset>  // 3
+#include <cmath>
+#include <cstddef>
+#include <cstdio>  // 3
+#include <cstdlib>  // 2
+#include <cstring>
+#include <deque>
+#include <fstream>  // 3
+#include <functional>
+#include <iomanip>  // 2
+#include <iosfwd>  // 2
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
+#include <numeric>  // 2
+#include <ostream>
+#include <queue>
+#include <set>
+#include <sstream>
+#include <stack>
+#include <string>
+#include <utility>
+#include <vector>