Reland "Move getPacProcessor() to GlueApiHelperForR"

This is a reland of 02b24a76

Forgot to add the line in proguard.py to make VerifiesOnR work
correctly.

Original change's description:
> Move getPacProcessor() to GlueApiHelperForR
>
> Follow up after feedback on http://crrev.com/c/2328302.
>
> Bug: 1111909
> Change-Id: If3107a6bc513d2aad898e8bc87c8436392ee057d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335385
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Nate Fischer <ntfschr@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#794655}

TBR=torne@chromium.org

Bug: 1111909
Change-Id: I64eafe0fb9093907a5510142d73455aee3af2c67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337385
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794814}

android_webview/glue/BUILD.gn

@@ -45,6 +45,7 @@ android_library("glue_java") {
     "java/src/com/android/webview/chromium/GlueApiHelperForOMR1.java",
     "java/src/com/android/webview/chromium/GlueApiHelperForP.java",
     "java/src/com/android/webview/chromium/GlueApiHelperForQ.java",
+    "java/src/com/android/webview/chromium/GlueApiHelperForR.java",
     "java/src/com/android/webview/chromium/GraphicsUtils.java",
     "java/src/com/android/webview/chromium/MonochromeLibraryPreloader.java",
     "java/src/com/android/webview/chromium/PacProcessorImpl.java",

android_webview/glue/java/src/com/android/webview/chromium/GlueApiHelperForR.java

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package com.android.webview.chromium;
+
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.webkit.PacProcessor;
+
+import org.chromium.base.annotations.VerifiesOnR;
+
+/**
+ * Utility class to use new APIs that were added in R (API level 30). These need to exist in a
+ * separate class so that Android framework can successfully verify glue layer classes without
+ * encountering the new APIs. Note that GlueApiHelper is only for APIs that cannot go to ApiHelper
+ * in base/, for reasons such as using system APIs or instantiating an adapter class that is
+ * specific to glue layer.
+ */
+@VerifiesOnR
+@TargetApi(Build.VERSION_CODES.R)
+public final class GlueApiHelperForR {
+    private GlueApiHelperForR() {}
+
+    public static PacProcessor getPacProcessor() {
+        return PacProcessorImpl.getInstance();
+    }
+}

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromiumFactoryProvider.java

@@ -17,6 +17,7 @@ import android.provider.Settings;
 import android.view.ViewGroup;
 import android.webkit.CookieManager;
 import android.webkit.GeolocationPermissions;
+import android.webkit.PacProcessor;
 import android.webkit.ServiceWorkerController;
 import android.webkit.TokenBindingService;
 import android.webkit.TracingController;
@@ -715,4 +716,9 @@ public class WebViewChromiumFactoryProvider implements WebViewFactoryProvider {
             getSingleton().getBrowserContextOnUiThread().setWebLayerRunningInSameProcess();
         });
     }
+
+    @Override
+    public PacProcessor getPacProcessor() {
+        return GlueApiHelperForR.getPacProcessor();
+    }
 }

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromiumFactoryProviderForR.java

@@ -4,8 +4,6 @@
 
 package com.android.webview.chromium;
 
-import android.webkit.PacProcessor;
-
 class WebViewChromiumFactoryProviderForR extends WebViewChromiumFactoryProvider {
     public static WebViewChromiumFactoryProvider create(android.webkit.WebViewDelegate delegate) {
         return new WebViewChromiumFactoryProviderForR(delegate);
@@ -14,9 +12,4 @@ class WebViewChromiumFactoryProviderForR extends WebViewChromiumFactoryProvider
     protected WebViewChromiumFactoryProviderForR(android.webkit.WebViewDelegate delegate) {
         super(delegate);
     }
-
-    @Override
-    public PacProcessor getPacProcessor() {
-        return PacProcessorImpl.getInstance();
-    }
 }

base/BUILD.gn

@@ -3556,6 +3556,7 @@ if (is_android) {
       "android/java/src/org/chromium/base/annotations/VerifiesOnOMR1.java",
       "android/java/src/org/chromium/base/annotations/VerifiesOnP.java",
       "android/java/src/org/chromium/base/annotations/VerifiesOnQ.java",
+      "android/java/src/org/chromium/base/annotations/VerifiesOnR.java",
       "android/java/src/org/chromium/base/compat/ApiHelperForM.java",
       "android/java/src/org/chromium/base/compat/ApiHelperForN.java",
       "android/java/src/org/chromium/base/compat/ApiHelperForO.java",

base/android/java/src/org/chromium/base/annotations/VerifiesOnR.java

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * The annotated method or class verifies on R, but not below.
+ *
+ * The annotated method (or methods on the annotated class) are guaranteed to not be inlined by R8
+ * on builds targeted below R. This prevents class verification errors (which results in a very slow
+ * retry-verification-at-runtime) from spreading into other classes on these lower versions.
+ */
+@Target({ElementType.CONSTRUCTOR, ElementType.METHOD, ElementType.TYPE})
+@Retention(RetentionPolicy.CLASS)
+public @interface VerifiesOnR {}

build/android/gyp/proguard.py

@@ -27,6 +27,7 @@ _API_LEVEL_VERSION_CODE = [
     (27, 'OMR1'),
     (28, 'P'),
     (29, 'Q'),
+    (30, 'R'),
 ]
 _CHECKDISCARD_RE = re.compile(r'^\s*-checkdiscard[\s\S]*?}', re.MULTILINE)
 _DIRECTIVE_RE = re.compile(r'^\s*-', re.MULTILINE)

chrome/android/expectations/monochrome_public_bundle.proguard_flags.expected

@@ -784,3 +784,13 @@
 -keepclassmembers,allowobfuscation class ** {
   @org.chromium.base.annotations.VerifiesOnQ <methods>;
 }
+-keep @interface org.chromium.base.annotations.VerifiesOnR
+-if @org.chromium.base.annotations.VerifiesOnR class * {
+    *** *(...);
+}
+-keep,allowobfuscation class <1> {
+    *** <2>(...);
+}
+-keepclassmembers,allowobfuscation class ** {
+  @org.chromium.base.annotations.VerifiesOnR <methods>;
+}

weblayer/browser/java/org/chromium/weblayer_private/WebLayerImpl.java

@@ -693,7 +693,9 @@ public final class WebLayerImpl extends IWebLayer.Stub {
     }
 
     private static void notifyWebViewRunningInProcess(ClassLoader webViewClassLoader) {
-        try {
+        // TODO(crbug.com/1112001): Investigate why loading classes causes strict mode
+        // violations in some situations.
+        try (StrictModeContext ignored = StrictModeContext.allowDiskReads()) {
             Class<?> webViewChromiumFactoryProviderClass =
                     Class.forName("com.android.webview.chromium.WebViewChromiumFactoryProvider",
                             true, webViewClassLoader);