[Instant Start] Disable Instant Start in Svelte

Bug: 1153604
Change-Id: I7e61b9da34f239c53a902aba8473d690dcaeeecb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580403Reviewed-by: Xi Han <hanxi@chromium.org>
Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Commit-Queue: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835322}

chrome/android/features/start_surface/internal/javatests/src/org/chromium/chrome/features/start_surface/InstantStartTest.java

@@ -52,11 +52,13 @@ import org.junit.Test;
 import org.junit.rules.ErrorCollector;
 import org.junit.runner.RunWith;
 
+import org.chromium.base.BaseSwitches;
 import org.chromium.base.BuildConfig;
 import org.chromium.base.Callback;
 import org.chromium.base.CommandLine;
 import org.chromium.base.NativeLibraryLoadedStatus;
 import org.chromium.base.StreamUtil;
+import org.chromium.base.SysUtils;
 import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.base.test.params.ParameterAnnotations;
 import org.chromium.base.test.params.ParameterProvider;
@@ -933,6 +935,25 @@ public class InstantStartTest {
         Assert.assertEquals(123, ((StaticLayout) activeLayout).getCurrentTabIdForTesting());
     }
 
+    @Test
+    @SmallTest
+    @CommandLineFlags.Add(BaseSwitches.ENABLE_LOW_END_DEVICE_MODE)
+    @Features.EnableFeatures({ChromeFeatureList.TAB_GROUPS_ANDROID,
+            ChromeFeatureList.TAB_GROUPS_CONTINUATION_ANDROID})
+    // clang-format off
+    public void  testInstantStartDisabledOnLowEndDevice() throws IOException {
+        // clang-format on
+        createTabStateFile(new int[] {123});
+        mActivityTestRule.startMainActivityFromLauncher();
+        // SysUtils.resetForTesting is required here due to the test restriction setup. With the
+        // RESTRICTION_TYPE_NON_LOW_END_DEVICE restriction on the class, SysUtils#detectLowEndDevice
+        // is called before the BaseSwitches.ENABLE_LOW_END_DEVICE_MODE is applied. Reset here to
+        // make sure BaseSwitches.ENABLE_LOW_END_DEVICE_MODE can be applied.
+        SysUtils.resetForTesting();
+
+        Assert.assertFalse(TabUiFeatureUtilities.supportInstantStart(false));
+    }
+
     @Test
     @SmallTest
     @Restriction({UiRestriction.RESTRICTION_TYPE_PHONE})

chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabUiFeatureUtilities.java

@@ -186,7 +186,8 @@ public class TabUiFeatureUtilities {
      */
     public static boolean supportInstantStart(boolean isTablet) {
         return !DeviceClassManager.enableAccessibilityLayout()
-                && CachedFeatureFlags.isEnabled(ChromeFeatureList.INSTANT_START) && !isTablet;
+                && CachedFeatureFlags.isEnabled(ChromeFeatureList.INSTANT_START) && !isTablet
+                && !SysUtils.isLowEndDevice();
     }
 
     /**