fix: use context counter as contextId (backport 3-0-x)

For sandboxed renderer it may not have a node::Environment in the context,
using a increasing counter as contextId works for all cases.

atom/renderer/atom_renderer_client.cc

@@ -79,6 +79,8 @@ void AtomRendererClient::RunScriptsAtDocumentEnd(
 void AtomRendererClient::DidCreateScriptContext(
     v8::Handle<v8::Context> context,
     content::RenderFrame* render_frame) {
+  RendererClientBase::DidCreateScriptContext(context, render_frame);
+
   // Only allow node integration for the main frame, unless it is a devtools
   // extension page.
   if (!render_frame->IsMainFrame() && !IsDevToolsExtension(render_frame))

atom/renderer/atom_sandboxed_renderer_client.cc

@@ -97,7 +97,7 @@ void InitializeBindings(v8::Local<v8::Object> binding,
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kGuestInstanceID))
     b.Set(options::kGuestInstanceID,
-        command_line->GetSwitchValueASCII(switches::kGuestInstanceID));
+          command_line->GetSwitchValueASCII(switches::kGuestInstanceID));
 }
 
 class AtomSandboxedRenderFrameObserver : public AtomRenderFrameObserver {
@@ -153,6 +153,8 @@ void AtomSandboxedRendererClient::RenderViewCreated(
 void AtomSandboxedRendererClient::DidCreateScriptContext(
     v8::Handle<v8::Context> context,
     content::RenderFrame* render_frame) {
+  RendererClientBase::DidCreateScriptContext(context, render_frame);
+
   // Only allow preload for the main frame or
   // For devtools we still want to run the preload_bundle script
   if (!render_frame->IsMainFrame() && !IsDevTools(render_frame))

atom/renderer/renderer_client_base.cc

@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "atom/common/color_util.h"
+#include "atom/common/context_counter.h"
 #include "atom/common/native_mate_converters/value_converter.h"
 #include "atom/common/options_switches.h"
 #include "atom/renderer/atom_autofill_agent.h"
@@ -17,7 +18,9 @@
 #include "atom/renderer/guest_view_container.h"
 #include "atom/renderer/preferences_manager.h"
 #include "base/command_line.h"
+#include "base/process/process_handle.h"
 #include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
 #include "chrome/renderer/media/chrome_key_systems.h"
 #include "chrome/renderer/pepper/pepper_helper.h"
 #include "chrome/renderer/printing/print_web_view_helper.h"
@@ -46,6 +49,14 @@
 #include "atom/common/atom_constants.h"
 #endif  // defined(ENABLE_PDF_VIEWER)
 
+// This is defined in later versions of Chromium, remove this if you see
+// compiler complaining duplicate defines.
+#if defined(OS_WIN) || defined(OS_FUCHSIA)
+#define CrPRIdPid "ld"
+#else
+#define CrPRIdPid "d"
+#endif
+
 namespace atom {
 
 namespace {
@@ -80,6 +91,19 @@ RendererClientBase::RendererClientBase() {
 
 RendererClientBase::~RendererClientBase() {}
 
+void RendererClientBase::DidCreateScriptContext(
+    v8::Handle<v8::Context> context,
+    content::RenderFrame* render_frame) {
+  // global.setHidden("contextId", `${processId}-${GetNextContextId()}`)
+  std::string context_id = base::StringPrintf(
+      "%" CrPRIdPid "-%d", base::GetCurrentProcId(), GetNextContextId());
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::Local<v8::String> key = mate::StringToSymbol(isolate, "contextId");
+  v8::Local<v8::Private> private_key = v8::Private::ForApi(isolate, key);
+  v8::Local<v8::Value> value = mate::ConvertToV8(isolate, context_id);
+  context->Global()->SetPrivate(context, private_key, value);
+}
+
 void RendererClientBase::AddRenderBindings(
     v8::Isolate* isolate,
     v8::Local<v8::Object> binding_object) {

atom/renderer/renderer_client_base.h

@@ -21,7 +21,7 @@ class RendererClientBase : public content::ContentRendererClient {
   ~RendererClientBase() override;
 
   virtual void DidCreateScriptContext(v8::Handle<v8::Context> context,
-                                      content::RenderFrame* render_frame) = 0;
+                                      content::RenderFrame* render_frame);
   virtual void WillReleaseScriptContext(v8::Handle<v8::Context> context,
                                         content::RenderFrame* render_frame) = 0;
   virtual void DidClearWindowObject(content::RenderFrame* render_frame);