Android double/triple click

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index e1437b451ef82a6ccbdaa7bcdb0cfded5a8c3592..7b2cda252580dae5997d7d07fb2c124379ae0edc 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -102,6 +102,9 @@ namespace content {
 namespace {
 
 static const char kAsyncReadBackString[] = "Compositing.CopyFromSurfaceTime";
+static const base::TimeDelta kClickCountInterval =
+    base::TimeDelta::FromSecondsD(0.5);
+static const float kClickCountRadiusSquaredDIP = 25;
 
 class PendingReadbackLock;
 
@@ -1801,11 +1804,33 @@ void RenderWidgetHostViewAndroid::SendMouseEvent(
   blink::WebInputEvent::Type webMouseEventType =
       ui::ToWebMouseEventType(motion_event.GetAction());
 
+  const base::TimeTicks current_time = base::TimeTicks::Now();
+  if (webMouseEventType == blink::WebInputEvent::kMouseDown) {
+    if (action_button == ui::MotionEventAndroid::BUTTON_PRIMARY) {
+      gfx::Point mousedown_point(motion_event.GetX(0), motion_event.GetY(0));
+      const base::TimeDelta time_delay =
+          current_time - prev_mousedown_timestamp_;
+      const float distance_squared =
+          (mousedown_point - prev_mousedown_point_).LengthSquared();
+      if (left_click_count_ > 2 || time_delay > kClickCountInterval ||
+          distance_squared > kClickCountRadiusSquaredDIP) {
+        left_click_count_ = 0;
+      }
+      prev_mousedown_timestamp_ = current_time;
+      prev_mousedown_point_ = mousedown_point;
+    } else {
+      // Reset state if middle or right button was pressed.
+      left_click_count_ = 0;
+      prev_mousedown_timestamp_ = base::TimeTicks();
+    }
+    left_click_count_++;
+  }
+
   blink::WebMouseEvent mouse_event = WebMouseEventBuilder::Build(
       webMouseEventType,
       ui::EventTimeStampToSeconds(motion_event.GetEventTime()),
       motion_event.GetX(0), motion_event.GetY(0), motion_event.GetFlags(),
-      motion_event.GetButtonState() ? 1 : 0 /* click count */,
+      motion_event.GetButtonState() ? left_click_count_ : 0 /* click count */,

[aelias_OOO_until_Jul13, 2017/06/21 19:59:01]

Hmm, I realized click_count needs to be set on MouseUp events as well according
to https://bugs.webkit.org/show_bug.cgi?id=49290.  I think that doesn't work
with this.

Also, it's confusing to use left_click_count_ for middle and right buttons now. 
How about a local variable click_count to distinguish?

       motion_event.GetPointerId(0), motion_event.GetPressure(0),
       motion_event.GetOrientation(0), motion_event.GetTiltX(0),
       motion_event.GetTiltY(0), action_button, motion_event.GetToolType(0));