Do not send DOM mouse events as synthesized

Author: daijro

additions/juggler/content/PageAgent.js

@@ -549,7 +549,7 @@ class PageAgent {
         false /*aIgnoreRootScrollFrame*/,
         0.0 /*pressure*/,
         0 /*inputSource*/,
-        true /*isDOMEventSynthesized*/,
+        false /*isDOMEventSynthesized*/,
         false /*isWidgetEventSynthesized*/,
         0 /*buttons*/,
         win.windowUtils.DEFAULT_MOUSE_POINTER_ID /* pointerIdentifier */,

additions/juggler/protocol/PageHandler.js

@@ -529,7 +529,7 @@ class PageHandler {
           false /* aIgnoreRootScrollFrame */,
           0.0 /* pressure */,
           0 /* inputSource */,
-          true /* isDOMEventSynthesized */,
+          false /* isDOMEventSynthesized */,
           false /* isWidgetEventSynthesized */,
           buttons,
           win.windowUtils.DEFAULT_MOUSE_POINTER_ID /* pointerIdentifier */,
@@ -583,7 +583,7 @@ class PageHandler {
           false /* aIgnoreRootScrollFrame */,
           0.0 /* pressure */,
           0 /* inputSource */,
-          true /* isDOMEventSynthesized */,
+          false /* isDOMEventSynthesized */,
           false /* isWidgetEventSynthesized */,
           buttons,
           win.windowUtils.DEFAULT_MOUSE_POINTER_ID /* pointerIdentifier */,