arc: Mix fixes in tracing view.

This fixes:
   tooltip position in case content is scrolled.
   average power computation.
   allows digits in normalized names.

TEST=Locally
BUG=b/143532713

Change-Id: I25f7976f2cb9832d05a93f2bea1d2590ba454516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899894Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712817}

chrome/browser/resources/chromeos/arc_graphics_tracing/arc_overview_tracing_ui.js

@@ -179,9 +179,10 @@ function getAveragePower(model, eventType) {
   var lastTimestamp = 0;
   var totalEnergy = 0;
   var index = events.getFirstEvent();
-  while (index > 0) {
+  while (index >= 0) {
     var timestamp = events.events[index][1];
-    totalEnergy = events.events[index][2] * (timestamp - lastTimestamp);
+    totalEnergy +=
+        events.events[index][2] * (timestamp - lastTimestamp) * 0.001;
     lastTimestamp = timestamp;
     index = events.getNextEvent(index, 1 /* direction */);
   }

chrome/browser/resources/chromeos/arc_graphics_tracing/arc_tracing_ui.js

@@ -1222,8 +1222,8 @@ class EventBands {
   showTooltipForEvent_(event, svg, height, width) {
     svg.setAttribute('height', height + 'px');
     svg.setAttribute('width', width + 'px');
-    this.tooltip.style.left = event.clientX + 'px';
-    this.tooltip.style.top = event.clientY + 'px';
+    this.tooltip.style.left = event.pageX + 'px';
+    this.tooltip.style.top = event.pageY + 'px';
     this.tooltip.style.height = height + 'px';
     this.tooltip.style.width = width + 'px';
     this.tooltip.classList.add('active');

chrome/browser/ui/webui/chromeos/arc_graphics_tracing/arc_graphics_tracing_handler.cc

@@ -88,7 +88,7 @@ base::FilePath GetModelPathFromTitle(Profile* profile,
       normalized_name[index++] = '_';
       continue;
     }
-    if (c >= 'a' && c <= 'z')
+    if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9'))
       normalized_name[index++] = c;
   }
   normalized_name[index] = 0;