Disable JavaScript entirely if no JSPlatform passed by embedder.

Allows run-time selection of whether to permit JS inside PDF. Previously,
this was a link-time decision only. This requires a little more caution
before we decide that we have the CJS_Runtime, and not the CJS_RuntimeStub
in a few casts.

Adds a kDisableJavaScript option to the form fill embeddertests.
Adds a --disable-javascript flag to the pdfium_test executable.
Also adds a --disable-xfa flag while we're at it.

Change-Id: I8d8ac95f6474459cadba9a60572fbb342e984646
Reviewed-on: https://pdfium-review.googlesource.com/31090
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/fxjs/ijs_runtime.h b/fxjs/ijs_runtime.h
index b97c65ef90..cde31c6e52 100644
--- a/fxjs/ijs_runtime.h
+++ b/fxjs/ijs_runtime.h
@@ -16,18 +16,22 @@
 #include "fxjs/fxjse.h"
 #endif  // PDF_ENABLE_XFA
 
+class CJS_Runtime;
 class CPDFSDK_FormFillEnvironment;
 class IJS_EventContext;
 
-// Owns the FJXS objects needed to actually execute JS.
+// Owns the FJXS objects needed to actually execute JS, if possible. This
+// virtual interface is backed by either an actual JS runtime, or a stub,
+// when JS is not present.
 class IJS_Runtime {
  public:
   static void Initialize(unsigned int slot, void* isolate);
   static void Destroy();
   static std::unique_ptr<IJS_Runtime> Create(
       CPDFSDK_FormFillEnvironment* pFormFillEnv);
-  virtual ~IJS_Runtime() {}
+  virtual ~IJS_Runtime();
 
+  virtual CJS_Runtime* AsCJSRuntime() = 0;
   virtual IJS_EventContext* NewEventContext() = 0;
   virtual void ReleaseEventContext(IJS_EventContext* pContext) = 0;
   virtual CPDFSDK_FormFillEnvironment* GetFormFillEnv() const = 0;