WIP: Reland CompiledScript, prototype compiling in a separate task.

third_party/WebKit/Source/core/dom/PendingScript.h

Index: third_party/WebKit/Source/core/dom/PendingScript.h
diff --git a/third_party/WebKit/Source/core/dom/PendingScript.h b/third_party/WebKit/Source/core/dom/PendingScript.h
index 1a82229fcee7ebf389cc7c099c2c214d5840658f..c6fab8c2c2c116a6cbd3d1db9b133b24eb73dd28 100644
--- a/third_party/WebKit/Source/core/dom/PendingScript.h
+++ b/third_party/WebKit/Source/core/dom/PendingScript.h
@@ -26,6 +26,7 @@
 #ifndef PendingScript_h
 #define PendingScript_h
 
+#include "bindings/core/v8/CompiledScript.h"
 #include "bindings/core/v8/ScriptStreamer.h"
 #include "core/CoreExport.h"
 #include "core/loader/resource/ScriptResource.h"
@@ -97,11 +98,13 @@ class CORE_EXPORT PendingScript final
 
   ScriptSourceCode getSource(const KURL& documentURL,
                              bool& errorOccurred) const;
+  CompiledScript* getCompiledScript() const { return m_compiledScript.get(); }
 
   void setStreamer(ScriptStreamer*);
   void streamingFinished();
 
-  bool isReady() const;
+  // TODO(jbroman): disambiguate what "ready" means
+  bool isReady() const;  // { return m_isReady; }
   bool errorOccurred() const;
 
   void dispose();
@@ -113,6 +116,13 @@ class CORE_EXPORT PendingScript final
                 bool isForTesting = false);
   PendingScript() = delete;
 
+  // Called when the final source is available (i.e. the resource has loaded,
+  // and streaming, if applicable, has completed).
+  void fetchFinished();
+
+  // Called when the script compile step is complete or determined unnecessary.
+  void compileFinished();
+
   void checkState() const;
 
   // ScriptResourceClient
@@ -125,6 +135,29 @@ class CORE_EXPORT PendingScript final
 
   bool m_watchingForLoad;
 
+  enum ReadyState {
+    kWaitingForResource,
+    kWaitingForStreaming,
+    kWaitingForCompile,
+    kReady,
+  };
+  void advanceReadyState(ReadyState readyState) {
+    CHECK_GT(readyState, m_readyState);
+    m_readyState = readyState;
+
+    if (resource()) {
+      CHECK_EQ(m_readyState > kWaitingForResource, resource()->isLoaded());
+      CHECK_EQ(
+          m_readyState > kWaitingForStreaming,
+          resource()->isLoaded() && (!m_streamer || m_streamer->isFinished()))
+          << "readystate=" << m_readyState << ' ' << resource()->isLoaded()
+          << ' ' << (m_streamer ? (m_streamer->isFinished() ? 'y' : 'n') : '-');
+    } else {
+      CHECK_EQ(m_readyState, kReady);
+    }
+  }
+  ReadyState m_readyState = kWaitingForResource;
+
   // |m_element| must points to the corresponding ScriptLoader's element and
   // thus must be non-null before dispose() is called (except for unit tests).
   Member<Element> m_element;
@@ -136,6 +169,8 @@ class CORE_EXPORT PendingScript final
   Member<ScriptStreamer> m_streamer;
   Member<PendingScriptClient> m_client;
 
+  Member<CompiledScript> m_compiledScript;
+
   // This flag is used to skip non-null checks of |m_element| in unit tests,
   // because |m_element| can be null in unit tests.
   const bool m_isForTesting;