Handle ctrl + shift + left click on links in PDF.

pdf/pdf_engine.h

Index: pdf/pdf_engine.h
diff --git a/pdf/pdf_engine.h b/pdf/pdf_engine.h
index 5bba8b9f86061216229b6d582e3f8722ed840e9d..cbe37348ddeb534798b292d609e4afb22dc61849 100644
--- a/pdf/pdf_engine.h
+++ b/pdf/pdf_engine.h
@@ -61,6 +61,15 @@ class PDFEngine {
   // The interface that's provided to the rendering engine.
   class Client {
    public:
+    // JavaScript counterpart of the enum is in navigator.js
+    // and they need to stay in sync.
+    enum class NavigateOption {
+      OPEN_IN_CURRENT_TAB = 0,
+      OPEN_IN_NEW_BACKGROUND_TAB,
+      OPEN_IN_NEW_FOREGROUND_TAB,
+      OPEN_IN_NEW_WINDOW,
+    };
+
     virtual ~Client() {}
 
     // Informs the client about the document's size in pixels.
@@ -80,7 +89,7 @@ class PDFEngine {
     virtual void ScrollToPage(int page) = 0;
 
     // Navigate to the given url.
-    virtual void NavigateTo(const std::string& url, bool open_in_new_tab) = 0;
+    virtual void NavigateTo(const std::string& url, NavigateOption option) = 0;
 
     // Updates the cursor.
     virtual void UpdateCursor(PP_CursorType_Dev cursor) = 0;