[iOS] Allow overriding icuctl.dat file location.

This allows for iOS to only ship one icuctl.dat file for the main bundle
and for the today extension.

BUG=

Review URL: https://codereview.chromium.org/1568363002

Cr-Commit-Position: refs/heads/master@{#368461}

3 files changed, 35 insertions, 0 deletions

diff --git a/base/i18n/icu_util.cc b/base/i18n/icu_util.cc
index d7e45c3..08dbeb3 100644
--- a/base/i18n/icu_util.cc
+++ b/base/i18n/icu_util.cc
@@ -28,6 +28,10 @@
 #include "base/android/apk_assets.h"
 #endif
 
+#if defined(OS_IOS)
+#include "base/ios/ios_util.h"
+#endif
+
 #if defined(OS_MACOSX)
 #include "base/mac/foundation_util.h"
 #endif
@@ -124,6 +128,12 @@ void LazyInitIcuDataFile() {
   ScopedCFTypeRef<CFStringRef> data_file_name(
       SysUTF8ToCFStringRef(kIcuDataFileName));
   FilePath data_path = mac::PathForFrameworkBundleResource(data_file_name);
+#if defined(OS_IOS)
+  FilePath override_data_path = base::ios::FilePathOfEmbeddedICU();
+  if (!override_data_path.empty()) {
+    data_path = override_data_path;
+  }
+#endif  // !defined(OS_IOS)
   if (data_path.empty()) {
     LOG(ERROR) << kIcuDataFileName << " not found in bundle";
     return;
diff --git a/base/ios/ios_util.h b/base/ios/ios_util.h
index e677adc..3b276ff 100644
--- a/base/ios/ios_util.h
+++ b/base/ios/ios_util.h
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include "base/base_export.h"
+#include "base/files/file_path.h"
 
 namespace base {
 namespace ios {
@@ -30,6 +31,14 @@ BASE_EXPORT bool IsRunningOnOrLater(int32_t major,
 // example by using the "RTL Psuedolanguage" option when launching from XCode).
 BASE_EXPORT bool IsInForcedRTL();
 
+// Stores the |path| of the ICU dat file in a global to be referenced later by
+// FilePathOfICUFile().  This should only be called once.
+BASE_EXPORT void OverridePathOfEmbeddedICU(const char* path);
+
+// Returns the overriden path set by OverridePathOfEmbeddedICU(), otherwise
+// returns invalid FilePath.
+BASE_EXPORT FilePath FilePathOfEmbeddedICU();
+
 }  // namespace ios
 }  // namespace base
 
diff --git a/base/ios/ios_util.mm b/base/ios/ios_util.mm
index 627fb40..bc10d19 100644
--- a/base/ios/ios_util.mm
+++ b/base/ios/ios_util.mm
@@ -11,6 +11,7 @@
 #include "base/sys_info.h"
 
 namespace {
+
 // Return a 3 elements array containing the major, minor and bug fix version of
 // the OS.
 const int32_t* OSVersionAsArray() {
@@ -19,6 +20,9 @@ const int32_t* OSVersionAsArray() {
       &digits[0], &digits[1], &digits[2]);
   return digits;
 }
+
+std::string* g_icudtl_path_override = nullptr;
+
 }  // namespace
 
 namespace base {
@@ -48,5 +52,17 @@ bool IsInForcedRTL() {
   return [defaults boolForKey:@"NSForceRightToLeftWritingDirection"];
 }
 
+void OverridePathOfEmbeddedICU(const char* path) {
+  DCHECK(!g_icudtl_path_override);
+  g_icudtl_path_override = new std::string(path);
+}
+
+FilePath FilePathOfEmbeddedICU() {
+  if (g_icudtl_path_override) {
+    return FilePath(*g_icudtl_path_override);
+  }
+  return FilePath();
+}
+
 }  // namespace ios
 }  // namespace base