Take changelog from extension if provided

src/vs/platform/extensionManagement/common/extensionManagement.ts

@@ -111,6 +111,7 @@ export interface IGalleryExtensionProperties {
 export interface IGalleryExtensionAssets {
 	manifest: string;
 	readme: string;
+	changelog: string;
 	download: string;
 	icon: string;
 	iconFallback: string;

src/vs/platform/extensionManagement/node/extensionGalleryService.ts

@@ -96,6 +96,7 @@ enum FilterType {
 const AssetType = {
 	Icon: 'Microsoft.VisualStudio.Services.Icons.Default',
 	Details: 'Microsoft.VisualStudio.Services.Content.Details',
+	Changelog: 'Microsoft.VisualStudio.Services.Content.Changelog',
 	Manifest: 'Microsoft.VisualStudio.Code.Manifest',
 	VSIX: 'Microsoft.VisualStudio.Services.VSIXPackage',
 	License: 'Microsoft.VisualStudio.Services.Content.License',
@@ -223,6 +224,7 @@ function toExtension(galleryExtension: IRawGalleryExtension, extensionsGalleryUr
 	const assets = {
 		manifest: getAssetSource(version.files, AssetType.Manifest),
 		readme: getAssetSource(version.files, AssetType.Details),
+		changelog: getAssetSource(version.files, AssetType.Changelog),
 		download: `${ getAssetSource(version.files, AssetType.VSIX) }?install=true`,
 		icon,
 		iconFallback,

src/vs/workbench/parts/extensions/electron-browser/extensionsWorkbenchService.ts

@@ -109,7 +109,7 @@ class Extension implements IExtension {
 			return this.local.changelogUrl;
 		}
 
-		return ''; // Hopefully we will change this once the gallery will support that.
+		return this.gallery && this.gallery.assets.changelog;
 	}
 
 	get iconUrl(): string {