First step to boot rn apps with hot bytecode cache

Reviewed By: tadeuzagallo

Differential Revision: D3561565

fbshipit-source-id: dc1cf580d7b31f30939b180aec38d9b8d0dd0f58

ReactAndroid/src/main/java/com/facebook/react/cxxbridge/UnpackingJSBundleLoader.java

@@ -40,10 +40,16 @@ public class UnpackingJSBundleLoader extends JSBundleLoader {
 
   /**
    * Flag passed to loadScriptFromOptimizedBundle to let the bridge know that
-   * the unpacked unpacked js source file.
+   * the unpacker unpacked js source file.
    */
   public static final int UNPACKED_JS_SOURCE = (1 << 0);
 
+  /**
+   * Flag passed to loadScriptFromOptimizedBundle to let the bridge know that
+   * the unpacker unpacked bytecode cache files.
+   */
+  public static final int UNPACKED_BC_CACHE = (1 << 1);
+
   /**
    * Name of the lock files. Multiple processes can be spawned off the same app
    * and we need to guarantee that at most one unpacks files at any time. To

ReactCommon/cxxreact/Executor.h

@@ -21,6 +21,7 @@ namespace react {
 
 enum {
   UNPACKED_JS_SOURCE = (1 << 0),
+  UNPACKED_BC_CACHE = (1 << 1),
 };
 
 class JSExecutor;

ReactCommon/cxxreact/JSCExecutor.cpp

@@ -275,6 +275,10 @@ void JSCExecutor::loadApplicationScript(
     return loadApplicationScript(std::move(jsScriptBigString), sourceURL);
   }
 
+  if (flags & UNPACKED_BC_CACHE) {
+    configureJSCBCCache(m_context, bundlePath);
+  }
+
   String jsSourceURL(sourceURL.c_str());
   JSSourceCodeRef sourceCode = JSCreateSourceCode(
       jsScriptBigString->fd(),