Version Handler to Unity Package Manager Package Migrator

Added a package migration feature to the Unity Package Manager
Resolver. This detects Version Handler packages installed in a
developer's project and provides a UI to select which ones to
migrate to UPM packages.

Bug: 150471207
Change-Id: I1816cc3cb4690194c780e5359f9f325f95f44d44

Author: Stewart Miles

build.gradle

@@ -1863,6 +1863,23 @@ createUnityIntegrationTest(
    new File("Google.UnityPackageManagerClientIntegrationTests.dll.mdb")],
   null, [])
 
+createUnityIntegrationTest(
+  "testPackageMigratorIntegrationTests",
+  ("Imports the plugin into a Unity project and uses the Package Migrator " +
+   "list packages that can be migrated and self migrate EDM to UPM. "),
+  [compileUnityPackageManagerResolver],
+  "PackageMigratorIntegrationTests",
+  fileTree(new File(new File(new File(project.ext.pluginSourceDir,
+                             "UnityPackageManagerResolver"), "test"),
+                    "PackageMigratorIntegrationTests")),
+  [new File("Google.PackageMigratorIntegrationTests.dll"),
+   new File("Google.PackageMigratorIntegrationTests.dll.mdb")],
+  new File(
+    project.ext.scriptDirectory,
+    "source/UnityPackageManagerResolver/test/" +
+    "PackageMigratorIntegrationTestsUnityProject"),
+  [])
+
 task cleanTests(type: Delete) {
   description "Clean test directories."
   delete project.ext.testDir

source/ExternalDependencyManager.sln

@@ -25,6 +25,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UnityPackageManagerResolver
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UnityPackageManagerClientIntegrationTests", "UnityPackageManagerResolver\test\UnityPackageManagerClientIntegrationTests.csproj", "{00A0DB5E-1120-24C9-331A-BE692C1F7C01}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PackageMigratorIntegrationTests", "UnityPackageManagerResolver\test\PackageMigratorIntegrationTests.csproj", "{4DBDEE33-4B6C-A866-93FE-04C15486BB03}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -79,5 +81,9 @@ Global
 		{00A0DB5E-1120-24C9-331A-BE692C1F7C01}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{00A0DB5E-1120-24C9-331A-BE692C1F7C01}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{00A0DB5E-1120-24C9-331A-BE692C1F7C01}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4DBDEE33-4B6C-A866-93FE-04C15486BB03}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4DBDEE33-4B6C-A866-93FE-04C15486BB03}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4DBDEE33-4B6C-A866-93FE-04C15486BB03}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4DBDEE33-4B6C-A866-93FE-04C15486BB03}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

source/UnityPackageManagerResolver/Properties/AssemblyInfo.cs

@@ -53,5 +53,6 @@
 //    limitations under the License.
 // </copyright>[assembly: AssemblyKeyFile("")]
 
+[assembly: InternalsVisibleTo("Google.PackageMigratorIntegrationTests")]
 [assembly: InternalsVisibleTo("Google.UnityPackageManagerResolverTests")]
 [assembly: InternalsVisibleTo("Google.UnityPackageManagerClientIntegrationTests")]

source/UnityPackageManagerResolver/UnityPackageManagerResolver.csproj

@@ -60,6 +60,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="src\PackageManifestModifier.cs" />
+    <Compile Include="src\PackageMigrator.cs" />
     <Compile Include="src\SettingsDialog.cs" />
     <Compile Include="src\UnityPackageManagerClient.cs" />
     <Compile Include="src\UnityPackageManagerResolver.cs" />