Android: expose cc/base/switches.cc to Java

No change to logic. This exposes cc/base/switches.cc to Java with
java_cpp_strings.

Fixed: 1114378
Test: autoninja -C out/Default system_webview_apk
Change-Id: Ie0ffebbaff78e2ee657b1518d8cab15c79760478
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343850Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797834}

android_webview/BUILD.gn

@@ -667,6 +667,7 @@ android_library("common_java") {
   ]
   deps = [
     "//base:base_java",
+    "//cc/base:cc_base_java",
     "//components/metrics:metrics_java",
     "//gpu/config:config_java",
     "//third_party/android_deps:androidx_annotation_annotation_java",

android_webview/java/src/org/chromium/android_webview/common/ProductionSupportedFlagList.java

@@ -5,6 +5,7 @@
 package org.chromium.android_webview.common;
 
 import org.chromium.base.BaseSwitches;
+import org.chromium.cc.base.CcSwitches;
 import org.chromium.components.metrics.MetricsSwitches;
 import org.chromium.gpu.config.GpuSwitches;
 
@@ -36,7 +37,7 @@ public final class ProductionSupportedFlagList {
             Flag.commandLine(AwSwitches.WEBVIEW_VERBOSE_LOGGING,
                     "WebView will log additional debugging information to logcat, such as "
                             + "variations and commandline state."),
-            Flag.commandLine("show-composited-layer-borders",
+            Flag.commandLine(CcSwitches.SHOW_COMPOSITED_LAYER_BORDERS,
                     "Renders a border around compositor layers to help debug and study layer "
                             + "compositing."),
             Flag.commandLine(AwSwitches.FINCH_SEED_EXPIRATION_AGE,

cc/base/BUILD.gn

@@ -4,6 +4,10 @@
 
 import("//cc/cc.gni")
 
+if (is_android) {
+  import("//build/config/android/rules.gni")
+}
+
 cc_component("base") {
   output_name = "cc_base"
   sources = [
@@ -59,3 +63,18 @@ cc_component("base") {
 
   defines = [ "CC_BASE_IMPLEMENTATION=1" ]
 }
+
+if (is_android) {
+  java_cpp_strings("java_switches_srcjar") {
+    # External code should depend on ":cc_base_java" instead.
+    visibility = [ ":*" ]
+    sources = [ "switches.cc" ]
+    template = "android/java/src/org/chromium/cc/base/CcSwitches.java.tmpl"
+  }
+
+  android_library("cc_base_java") {
+    # Right now, this only includes the Java switches. But if we need more Java
+    # files, they should be added here as necessary.
+    srcjar_deps = [ ":java_switches_srcjar" ]
+  }
+}

cc/base/android/java/src/org/chromium/cc/base/CcSwitches.java.tmpl

+// 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.cc.base;
+
+/**
+ * Contains all of the command line switches that are specific to the cc/ layer.
+ */
+public final class CcSwitches {{
+
+{NATIVE_STRINGS}
+
+    // Prevent instantiation.
+    private CcSwitches() {{}}
+}}