Make CJS_Objects track CJS_Runtime (and hence the document itself)

Precursor to removing some more v8::Context slot dependency.

There's a cost to maintaining the set of observers, but since these
objects are tied to V8 lifetimes, not C++ lifetimes, we want to be
very wary of the document going away unexpectedly.

Change-Id: I579f58a460aa50b88cb861227c9aca9a8a83ce12
Reviewed-on: https://pdfium-review.googlesource.com/33471
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/fxjs/cjs_scalewhen.cpp b/fxjs/cjs_scalewhen.cpp
index 59f04870ca..33f13cbe00 100644
--- a/fxjs/cjs_scalewhen.cpp
+++ b/fxjs/cjs_scalewhen.cpp
@@ -20,3 +20,9 @@ void CJS_ScaleWhen::DefineJSObjects(CFXJS_Engine* pEngine) {
       pEngine->DefineObj("scaleWhen", FXJSOBJTYPE_STATIC, nullptr, nullptr);
   DefineConsts(pEngine, ObjDefnID, ConstSpecs, FX_ArraySize(ConstSpecs));
 }
+
+CJS_ScaleWhen::CJS_ScaleWhen(v8::Local<v8::Object> pObject,
+                             CJS_Runtime* pRuntime)
+    : CJS_Object(pObject, pRuntime) {}
+
+CJS_ScaleWhen::~CJS_ScaleWhen() = default;