Introduce v8-cache-strategies-for-cache-storage setting flags.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 3bee3a4e25c65bb5eb4edcd0e927d28df1ab3737..6e1ec7051a092243d3d2549e1695ca31c0bab531 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6155,6 +6155,18 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_V8_CACHE_OPTIONS_CODE" desc="The V8 JavaScript engine supports three 'caching' modes: disabled; caching data generated by the JavaScript parser; or caching data generated by the JavaScript compiler. This option describes the 3rd of these, caching data generated by the compiler.">
         Cache V8 compiler data.
       </message>
+      <message name="IDS_FLAGS_V8_CACHE_STRATEGIES_FOR_CACHE_STORAGE_NAME" desc="Name of the about::flags setting for V8 cache strategies for CacheStorage. The V8 cache for CacheStorage supports three strategies: disabled; normal; aggressive. This is the option to choose among them.">
+        V8 caching strategy for CacheStorage.
+      </message>
+      <message name="IDS_FLAGS_V8_CACHE_STRATEGIES_FOR_CACHE_STORAGE_DESCRIPTION" desc="Description of the about::flags setting for V8 cache strategies for CacheStorage. The V8 cache for CacheStorage supports three strategies: disabled; normal; aggressive.">
+        Caching strategy of scripts in CacheStorage for the V8 JavaScript engine.
+      </message>
+      <message name="IDS_FLAGS_V8_CACHE_STRATEGIES_FOR_CACHE_STORAGE_NORMAL" desc="The V8 cache for CacheStorage supports three strategies: disabled; caching same as if the script is in HTTPCache; force caching on the first load. This option describes the 2nd of these, caching same as if the script is in HTTPCache.">
+        Normal
+      </message>
+      <message name="IDS_FLAGS_V8_CACHE_STRATEGIES_FOR_CACHE_STORAGE_AGGRESSIVE" desc="The V8 cache for CacheStorage supports three strategies: disabled; caching same as if the script is in HTTPCache; force caching on the first load. This option describes the 3rd of these, force caching on the first load.">
+        Aggressive
+      </message>
 
       <!-- Data Reduction Proxy -->
       <message name="IDS_FLAGS_DATA_REDUCTION_PROXY_LO_FI_NAME" desc="An about::flags experiment title to enable/disable Data Saver Lo-Fi" translateable="false">