Align drag threshold across content types.

third_party/WebKit/Source/core/input/MouseEventManager.cpp

Index: third_party/WebKit/Source/core/input/MouseEventManager.cpp
diff --git a/third_party/WebKit/Source/core/input/MouseEventManager.cpp b/third_party/WebKit/Source/core/input/MouseEventManager.cpp
index c80bf9337aa10a15b5e9e1e0e6cdb904c21b956e..6dc702e031d7433c1fbcdc3be534dcb6da2ca2ac 100644
--- a/third_party/WebKit/Source/core/input/MouseEventManager.cpp
+++ b/third_party/WebKit/Source/core/input/MouseEventManager.cpp
@@ -68,7 +68,7 @@ const double kTextDragDelay = 0.0;
 // The link drag hysteresis is much larger than the others because there
 // needs to be enough space to cancel the link press without starting a link
 // drag, and because dragging links is rare.

[Peter Kasting, 2016/10/06 09:05:36]

This comment should be updated or removed.

[pwnall, 2016/10/20 01:40:39]

Done.

-const int kLinkDragHysteresis = 40;
+const int kLinkDragHysteresis = 5;

[Peter Kasting, 2016/10/06 09:05:36]

Perhaps we should just use the text/image values below (depending on whether the
link is text/image, or whatever) instead of having a custom link value.

[pwnall, 2016/10/20 01:40:39]

I opted to prepare the path for obeying the platform preferences for drag and
drop thresholds. I created separate X and Y constants because Windows has
separate X and Y thresholds. 

 const int kImageDragHysteresis = 5;
 const int kTextDragHysteresis = 3;
 const int kGeneralDragHysteresis = 3;