Open hyperlinks in PDF in a new tab when middle mouse clicking.

pdf/pdfium/pdfium_engine.cc

Index: pdf/pdfium/pdfium_engine.cc
diff --git a/pdf/pdfium/pdfium_engine.cc b/pdf/pdfium/pdfium_engine.cc
index 05f73098ec7870b45d04f26cc6b176a2e21fb2f8..ef9aeef229a39da3b96f4fb1dc36fc885bfa742f 100644
--- a/pdf/pdfium/pdfium_engine.cc
+++ b/pdf/pdfium/pdfium_engine.cc
@@ -1527,8 +1527,10 @@ bool PDFiumEngine::OnMouseDown(const pp::MouseInputEvent& event) {
     selection_.clear();
     return true;
   }
-  if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT)
+  if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT &&
+      event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_MIDDLE) {
     return false;
+  }
 
   SelectionChangeInvalidator selection_invalidator(this);
   selection_.clear();
@@ -1620,8 +1622,10 @@ void PDFiumEngine::OnMultipleClick(int click_count,
 }
 
 bool PDFiumEngine::OnMouseUp(const pp::MouseInputEvent& event) {
-  if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT)
+  if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT &&
+      event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_MIDDLE) {
     return false;
+  }
 
   int page_index = -1;
   int char_index = -1;
@@ -1633,7 +1637,8 @@ bool PDFiumEngine::OnMouseUp(const pp::MouseInputEvent& event) {
   // Open link on mouse up for same link for which mouse down happened earlier.
   if (mouse_down_state_.Matches(area, target)) {
     if (area == PDFiumPage::WEBLINK_AREA) {
-      bool open_in_new_tab = !!(event.GetModifiers() & kDefaultKeyModifier);
+      bool open_in_new_tab = !!(event.GetModifiers() & kDefaultKeyModifier) ||
+          !!(event.GetModifiers() & PP_INPUTEVENT_MODIFIER_MIDDLEBUTTONDOWN);
       client_->NavigateTo(target.url, open_in_new_tab);
       client_->FormTextFieldFocusChange(false);
       return true;
@@ -3667,6 +3672,15 @@ FPDF_BOOL PDFiumEngine::Pause_NeedToPauseNow(IFSDK_PAUSE* param) {
       InMilliseconds() > engine->progressive_paint_timeout_;
 }
 
+std::vector<pp::Rect> PDFiumEngine::GetLinkRects() {
+  int page_index = GetMostVisiblePage();
+
+  if (page_index < 0)
+    return std::vector<pp::Rect>();
+
+  return pages_[page_index]->GetLinkRects();
+}
+
 ScopedUnsupportedFeature::ScopedUnsupportedFeature(PDFiumEngine* engine)
     : engine_(engine), old_engine_(g_engine_for_unsupported) {
   g_engine_for_unsupported = engine_;