Switching Clank to use direction-based selection granularity strategy and adding a chrome flag.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 48d8576df52e2bada55ba35d105fac803873b2d6..ce2f5975f92bf29c10ae133c19f3c3c576d13e16 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -178,6 +178,16 @@ const Experiment::Choice kOverscrollHistoryNavigationChoices[] = {
 };
 #endif
 
+const Experiment::Choice kTouchTextSelectionStrategyChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_TOUCH_SELECTION_STRATEGY_CHARACTER,
+    switches::kTouchTextSelectionStrategy,
+    "character" },
+  { IDS_TOUCH_SELECTION_STRATEGY_DIRECTION,
+    switches::kTouchTextSelectionStrategy,
+    "direction" }
+};
+
 #if !defined(DISABLE_NACL)
 const Experiment::Choice kNaClDebugMaskChoices[] = {
   // Secure shell can be used on ChromeOS for forwarding the TCP port opened by
@@ -1200,6 +1210,13 @@ const Experiment kExperiments[] = {
                               switches::kDisableTouchEditing)
   },
   {
+      "touch-selection-strategy",
+      IDS_FLAGS_TOUCH_SELECTION_STRATEGY_NAME,
+      IDS_FLAGS_TOUCH_SELECTION_STRATEGY_DESCRIPTION,
+      kOsAndroid,   // TODO(mfomitchev): Add CrOS/Win/Linux support soon.
+      MULTI_VALUE_TYPE(kTouchTextSelectionStrategyChoices)
+  },
+  {
     "enable-stale-while-revalidate",
     IDS_FLAGS_ENABLE_STALE_WHILE_REVALIDATE_NAME,
     IDS_FLAGS_ENABLE_STALE_WHILE_REVALIDATE_DESCRIPTION,