Remove the blocking touch handlers for the input[type=range] and add touch-action instead

third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp

Index: third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp b/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp
index 8d9d3f157686106527291c1d3c1f15c6a4c3c210..7c3a1b5884a9f3e055fb52483082f2383eab1b15 100644
--- a/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.cpp
@@ -143,6 +143,24 @@ void SliderThumbElement::setPositionFromPoint(const LayoutPoint& point)
     }
     position = std::min(position, trackSize).clampNegativeToZero();
     const Decimal ratio = Decimal::fromDouble(static_cast<double>(position) / trackSize);
+    HTMLInputElement* host = hostInput();

[majidvp, 2016/08/04 15:20:36]

I don't think this component should be involved with the details of touch-action
behaviour on its host. This should either become part of LayoutSliderContainer 
or RangeInputType.

+    if (!isVertical) {

[majidvp, 2016/08/04 15:20:36]

Good catch handling the vertical case. I think the initial value for
touch-action
should also take into account vertical mode.

+        if (ratio <= Decimal(0)) {
+            host->setAttribute(styleAttr, "touch-action:pan-y pan-left");
+        } else if (ratio >= Decimal(1)) {
+            host->setAttribute(styleAttr, "touch-action:pan-y pan-right");
+        } else {
+            host->setAttribute(styleAttr, "touch-action:pan-y");
+        }
+    } else {
+        if (ratio <= Decimal(0)) {
+            host->setAttribute(styleAttr, "touch-action:pan-x pan-down");
+        } else if (ratio >= Decimal(1)) {
+            host->setAttribute(styleAttr, "touch-action:pan-x pan-up");
+        } else {
+            host->setAttribute(styleAttr, "touch-action:pan-x");
+        }
+    }
     const Decimal fraction = isVertical || !isLeftToRightDirection ? Decimal(1) - ratio : ratio;
     StepRange stepRange(input->createStepRange(RejectAny));
     Decimal value = stepRange.clampValue(stepRange.valueFromProportion(fraction));