Handle long press in PDF documents.

pdf/out_of_process_instance.h

Index: pdf/out_of_process_instance.h
diff --git a/pdf/out_of_process_instance.h b/pdf/out_of_process_instance.h
index ae1b8e16f519f9d0139869f05e26d1e19a213f84..57eb6ce740094090050de29b9ec9c66faed831d5 100644
--- a/pdf/out_of_process_instance.h
+++ b/pdf/out_of_process_instance.h
@@ -85,6 +85,7 @@ class OutOfProcessInstance : public pp::Instance,
 
   // Called when the timer is fired.
   void OnClientTimerFired(int32_t id);
+  void OnClientTouchTimerFired(int32_t id);
 
   // Called to print without re-entrancy issues.
   void OnPrint(int32_t);
@@ -121,6 +122,7 @@ class OutOfProcessInstance : public pp::Instance,
   std::string ShowFileSelectionDialog() override;
   pp::URLLoader CreateURLLoader() override;
   void ScheduleCallback(int id, int delay_in_ms) override;
+  void ScheduleTouchTimerCallback(int id, int delay_in_ms) override;
   void SearchString(const base::char16* string,
                     const base::char16* term,
                     bool case_sensitive,
@@ -235,6 +237,8 @@ class OutOfProcessInstance : public pp::Instance,
   // Size of entire document in pixels (i.e. if each page is 800 pixels high and
   // there are 10 pages, the height will be 8000).
   pp::Size document_size_;
+  // The scroll offset
+  pp::Point scroll_offset_;

[Lei Zhang, 2017/05/03 01:52:53]

BTW, there's another scroll offset below that's a pp::FloatPoint. Haven't looked
at if we need both, or if this needs to be a FloatPoint.

[dsinclair, 2017/05/03 14:18:41]

The one below is used specifically for pinch zooming. It doesn't get it's size
from pepper, it gets it from the pinch message.

This one could be a float, but we use the number as an int later anyway, so just
storing as an int seems fine.

 
   // Enumeration of pinch states.
   // This should match PinchPhase enum in