Add the ability to turn off dependency locking

This makes it easy to experiment with new dependency versions or new plugins
without having to update the lock files, by adding "-PdisableDependencyLocking=true" to any gradle command.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=249463575

gradle/build.gradle

@@ -1,7 +1,9 @@
 buildscript {
-  // Lock buildscript dependencies.
-  configurations.classpath {
-    resolutionStrategy.activateDependencyLocking()
+  if (project.disableDependencyLocking.toBoolean() == false) {
+    // Lock buildscript dependencies.
+    configurations.classpath {
+      resolutionStrategy.activateDependencyLocking()
+    }
   }
 
   dependencies {
@@ -98,16 +100,18 @@ subprojects {
   // Skip no-op project
   if (project.name == 'services') return
 
-  buildscript {
-    // Lock buildscript dependencies.
-    configurations.classpath {
-      resolutionStrategy.activateDependencyLocking()
-    }
-  }
 
-  // Lock application dependencies.
-  dependencyLocking {
-    lockAllConfigurations()
+  if (rootProject.disableDependencyLocking.toBoolean() == false) {
+    buildscript {
+      // Lock buildscript dependencies.
+      configurations.classpath {
+        resolutionStrategy.activateDependencyLocking()
+      }
+    }
+    // Lock application dependencies.
+    dependencyLocking {
+      lockAllConfigurations()
+    }
   }
 
   def services = [':services:default',

gradle/buildSrc/build.gradle

@@ -1,7 +1,9 @@
 buildscript {
-  // Lock buildscript dependencies.
-  configurations.classpath {
-    resolutionStrategy.activateDependencyLocking()
+  if (rootProject.disableDependencyLocking.toBoolean() == false) {
+    // Lock buildscript dependencies.
+    configurations.classpath {
+      resolutionStrategy.activateDependencyLocking()
+    }
   }
 }
 
@@ -17,9 +19,11 @@ plugins {
   id 'com.diffplug.gradle.spotless' version '3.18.0'
 }
 
-// Lock application dependencies.
-dependencyLocking {
-  lockAllConfigurations()
+if (rootProject.disableDependencyLocking.toBoolean() == false) {
+  // Lock application dependencies.
+  dependencyLocking {
+    lockAllConfigurations()
+  }
 }
 
 repositories {

gradle/buildSrc/gradle.properties

@@ -0,0 +1 @@
+disableDependencyLocking=false

gradle/gradle.properties

@@ -4,3 +4,4 @@ uploaderDestination=
 uploaderCredentialsFile=
 uploaderMultithreadedUpload=
 flowDocsFile=
+disableDependencyLocking=false