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

README.chromium

Index: README.chromium
===================================================================
--- README.chromium	(revision 239289)
+++ README.chromium	(working copy)
@@ -180,9 +180,10 @@
     (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
@@ -192,13 +193,13 @@
       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
@@ -213,7 +214,11 @@
     - 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