[Paint Preview] Prevent showing after a native page

If a native page is shown as the first thing after startup it is
possible a preview will be shown. This CL avoids that scenario.

Bug: 1142856
Change-Id: Id309d58a810b0f58649dc4b11dba8398fcb8e1ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502391Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821392}

chrome/android/java/src/org/chromium/chrome/browser/paint_preview/PaintPreviewHelper.java

@@ -84,6 +84,12 @@ public class PaintPreviewHelper {
         tabModelSelector.addObserver(new EmptyTabModelSelectorObserver() {
             @Override
             public void onTabStateInitialized() {
+                // If the first tab shown is not a normal tab, then prevent showing previews in the
+                // future.
+                if (preventShowOnRestore(tabModelSelector.getCurrentTab())) {
+                    sShouldShowOnRestore = false;
+                }
+
                 // Avoid running the audit in multi-window mode as otherwise we will delete
                 // data that is possibly in use by the other Activity's TabModelSelector.
                 PaintPreviewTabServiceFactory.getServiceInstance().onRestoreCompleted(
@@ -92,6 +98,16 @@ public class PaintPreviewHelper {
                         /*captureOnSwitch=*/false);
                 tabModelSelector.removeObserver(this);
             }
+
+            private boolean preventShowOnRestore(Tab tab) {
+                if (tab == null || tab.isShowingErrorPage() || tab.isNativePage()) {
+                    return true;
+                }
+
+                String scheme = tab.getUrl().getScheme();
+                boolean httpOrHttps = scheme.equals("http") || scheme.equals("https");
+                return !httpOrHttps;
+            }
         });
     }