Fix the HC colors for the process-internals page.

This change fixes multiple issues with the process-internals page when
viewed in high contrast. Specifically, the header background and tree
highlight colors are fixed. See the bug for screenshots.

Bug: 1023585
Change-Id: I6405e8b02c5020eb64d3aff93c564ab20a613ef0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911482Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Cliff Smolinsky <cliffsmo@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#714514}

content/browser/resources/process/process_internals.css

@@ -81,6 +81,12 @@ body {
   z-index: 1;
 }
 
+@media(forced-colors) {
+  .content-header {
+    background: none;
+  }
+}
+
 .tree-label {
   user-select: text;
 }

ui/webui/resources/css/tree.css

@@ -171,3 +171,15 @@ html[dir=rtl] .tree-item[editing] input {
   margin: -2px -3px -2px -8px;
   padding: 1px 1px 1px 7px;
 }
+
+@media(forced-colors) {
+  .tree-row[selected],
+  .tree-row:hover,
+  .tree-row[selected]:hover,
+  tree:focus .tree-row[selected] {
+    background-color: Highlight;
+    background-image: none;
+    color: HighlightText;
+    forced-color-adjust: none;
+  }
+}