Run FXJS_V8 embedder tests against a shared isolate.

testing/embedder_test.h

Index: testing/embedder_test.h
diff --git a/testing/embedder_test.h b/testing/embedder_test.h
index f490f82536b3e14c079f6254f044024e8761b330..f6842d23c3233701f51d94c4887303ebf0b7709f 100644
--- a/testing/embedder_test.h
+++ b/testing/embedder_test.h
@@ -12,6 +12,7 @@
 #include "../public/fpdf_ext.h"
 #include "../public/fpdf_formfill.h"
 #include "../public/fpdfview.h"
+#include "../third_party/base/nonstd_unique_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "v8/include/v8.h"
 
@@ -60,8 +61,11 @@ class EmbedderTest : public ::testing::Test,
   void SetUp() override;
   void TearDown() override;
 
+  // Call before SetUp to pass shared isolate, otherwise PDFium creates one.
+  void SetExternalIsolate(v8::Isolate* isolate) { external_isolate_ = isolate; }
+
   void SetDelegate(Delegate* delegate) {
-    delegate_ = delegate ? delegate : default_delegate_;
+    delegate_ = delegate ? delegate : default_delegate_.get();
   }
 
   FPDF_DOCUMENT document() { return document_; }
@@ -94,7 +98,7 @@ class EmbedderTest : public ::testing::Test,
 
  protected:
   Delegate* delegate_;
-  Delegate* default_delegate_;
+  nonstd::unique_ptr<Delegate> default_delegate_;
   FPDF_DOCUMENT document_;
   FPDF_FORMHANDLE form_handle_;
   FPDF_AVAIL avail_;
@@ -104,6 +108,7 @@ class EmbedderTest : public ::testing::Test,
   v8::Platform* platform_;
   v8::StartupData natives_;
   v8::StartupData snapshot_;
+  v8::Isolate* external_isolate_;
   TestLoader* loader_;
   size_t file_length_;
   char* file_contents_;