Add support for icu_use_data_file=1 to icu.gyp on Windows

README.chromium

 Name: icu
 URL: http://site.icu-project.org/
 Version: 4.6
 License: MIT
 Security Critical: yes
 
 Description:
 This directory contains the source code of ICU 4.6 for C/C++
 
 1. It was obtained with the following:
@@ skipping 162 matching lines @@
 
     'make' will fail in the 1st pass. Copy source/data/in/coll/invuca.icu
     to {BUILD_DIR_ROOT}/data/out/build/icudt46l/coll and re-run 'make'
     in {BUILD_DIR_ROOT}/data.
 
     'make' will fail again when pkgdata looks for css3transform.res. Edit 
     data/out/tmp/icudata.lst to replace 'css3transform.res' with 'root.res'.
     (see http://bugs.icu-project.org/trac/ticket/10570 ) and run 'make' again.
 
 
-    - source/data/in/icudt46l.dat : Built on Linux with all the patches
-      above applied. This file will be generated in 
-      {BUILD_DIR_ROOT}/data/out/tmp.
+    - source/data/in/icudtl.dat : Built on Linux with all the patches
+      above applied. icudt46l.dat is generated in 
+      {BUILD_DIR_ROOT}/data/out/tmp and copied to the above location with a
+      version number (46) dropped.
 
     - windows/icudt.dll : With icudt46l.dat in place, all the patches applied
       and header files moved (#11 below), generated by building icudt_build
       project of build/icudt_build.sln on Windows. icudt46.dll is
       generated in bin/{Release,Debug} and copied to windows/icudt.dll
       and checked in. Note that we drop the version number ('46') from the
       dll name to avoind having to update our build scripts/configuration
       files everytime ICU is upgraded to a new version.
 
-    - {mac,linux}/icudt46l_dat.S : Built on Mac and Linux with all the
+    - {mac,linux}/icudt46l_dat.S : Built on Linux with all the
       patches above (except android/brkitr.patch) applied and checked in.
       This file will be generated in {BUILD_DIR_ROOT}/data/out/tmp.
 
-      Alternatively, one can just generate icudt46l_dat.S on Linux and adopt
-      the header portion to match the current header in mac/icudt46l_dat.S.
-      That is as following without no leading space in each line:
+      mac/icudt46l_dat.S is identical to linux/icudt46l_dat.S. It's made
+      by changing the header portion of the Linux version to read as following
+      (no leading whitespace) : 
 
           .globl _icudt46_dat
           #ifdef U_HIDE_DATA_SYMBOL
                  .private_extern _icudt46_dat
           #endif
                  .data
                  .const
                  .align 4
           _icudt46_dat:
 
 
     - android/icudt46l_dat.S : Built on Linux with all the patches above and
       android/brkitr.patch applied and android/patch_locale.sh executed, and
       checked in.
+    - android/icudtl.dat : Generated as icudt46l.dat in 
+      {BUILD_DIR_ROOT}/data/out/tmp along with icudt46l_dat.S and 
+      copied to the above location with '46' dropped in its name.
+
 
 12. Apply the fix found with static analysis tools such as PSV and coverity
 
   - patches/static.analysis.patch
   - upstream trunk/4.8 do not have this code any more.
 
 13. Fix for msvs2010 applied:
 --- D:/src/ent/src/third_party/icu/source/common/stringpiece.cpp
  (revision 78292)
 +++ D:/src/ent/src/third_party/icu/source/common/stringpiece.cpp
@@ skipping 58 matching lines @@
 24. Fix compilation errors on VS2012 and above.
     - patches/vs2012.patch
 
 25. Fix a buffer overflow in UTF-16/32 detection.
     - patches/csetdet.patch
     - upstream bug: http://bugs.icu-project.org/trac/ticket/10318
 
 26. Add BreakIterator::getRuleStatus
     - patches/breakiterator.patch
     - Copy and paste BreakIterator::getRuleStatus API from ICU 52