[ICU] Avoid reading ICU data files in render process.

base/i18n/icu_util.cc

Index: base/i18n/icu_util.cc
diff --git a/base/i18n/icu_util.cc b/base/i18n/icu_util.cc
index 6001ea10d050e502b07b8c53b71c493a0e5956f9..e0bd62cc50b0fe824d25beacbc94bb42e20908b7 100644
--- a/base/i18n/icu_util.cc
+++ b/base/i18n/icu_util.cc
@@ -4,8 +4,6 @@
 
 #include "base/i18n/icu_util.h"
 
-#include "build/build_config.h"
-
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
@@ -55,6 +53,33 @@ bool g_check_called_once = true;
 #endif
 }
 
+
+#if defined(OS_ANDROID)
+bool InitializeICUWithFileDescriptor(int data_fd) {
+#if !defined(NDEBUG)
+  DCHECK(!g_check_called_once || !g_called_once);
+  g_called_once = true;
+#endif
+
+#if (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_STATIC)
+  // The ICU data is statically linked.
+  return true;
+#elif (ICU_UTIL_DATA_IMPL == ICU_UTIL_DATA_FILE)
+  CR_DEFINE_STATIC_LOCAL(base::MemoryMappedFile, mapped_file, ());
+  if (!mapped_file.IsValid()) {
+    if (!mapped_file.Initialize(base::File(data_fd))) {
+      LOG(ERROR) << "Couldn't mmap icu data file";
+      return false;
+    }
+  }
+  UErrorCode err = U_ZERO_ERROR;
+  udata_setCommonData(const_cast<uint8*>(mapped_file.data()), &err);
+  return err == U_ZERO_ERROR;
+#endif // ICU_UTIL_DATA_FILE
+}
+#endif
+
+
 bool InitializeICU() {
 #if !defined(NDEBUG)
   DCHECK(!g_check_called_once || !g_called_once);