fix scroll dispatcher circular dep

src/lib/core/overlay/overlay-directives.ts

@@ -23,11 +23,10 @@ import {
 import {PortalModule} from '../portal/portal-directives';
 import {ConnectedPositionStrategy} from './position/connected-position-strategy';
 import {Dir, LayoutDirection} from '../rtl/dir';
-import {Scrollable} from './scroll/scrollable';
 import {coerceBooleanProperty} from '../coercion/boolean-property';
 import {ESCAPE} from '../keyboard/keycodes';
 import {Subscription} from 'rxjs/Subscription';
-import {ScrollDispatchModule} from './scroll/scroll-dispatcher';
+import {ScrollDispatchModule} from './scroll/index';
 
 
 /** Default set of positions for the overlay. Follows the behavior of a dropdown. */

src/lib/core/overlay/position/connected-position-strategy.spec.ts

@@ -7,7 +7,7 @@ import {Scrollable} from '../scroll/scrollable';
 import {Subscription} from 'rxjs/Subscription';
 import {TestBed, inject} from '@angular/core/testing';
 import Spy = jasmine.Spy;
-import {ScrollDispatchModule} from '../scroll/scroll-dispatcher';
+import {ScrollDispatchModule} from '../scroll/index';
 
 
 // Default width and height of the overlay and origin panels throughout these tests.

src/lib/core/overlay/position/viewport-ruler.spec.ts

@@ -1,6 +1,6 @@
 import {ViewportRuler, VIEWPORT_RULER_PROVIDER} from './viewport-ruler';
 import {TestBed, inject} from '@angular/core/testing';
-import {ScrollDispatchModule} from '../scroll/scroll-dispatcher';
+import {ScrollDispatchModule} from '../scroll/index';
 
 
 // For all tests, we assume the browser window is 1024x786 (outerWidth x outerHeight).

src/lib/core/overlay/scroll/index.ts

@@ -0,0 +1,15 @@
+import {NgModule} from '@angular/core';
+import {SCROLL_DISPATCHER_PROVIDER} from './scroll-dispatcher';
+import {Scrollable} from './scrollable';
+import {PlatformModule} from '../../platform/index';
+
+export {Scrollable} from './scrollable';
+export {ScrollDispatcher} from './scroll-dispatcher';
+
+@NgModule({
+  imports: [PlatformModule],
+  exports: [Scrollable],
+  declarations: [Scrollable],
+  providers: [SCROLL_DISPATCHER_PROVIDER],
+})
+export class ScrollDispatchModule { }

src/lib/core/overlay/scroll/scroll-dispatcher.ts

@@ -1,5 +1,5 @@
-import {NgModule, ElementRef, Injectable, NgZone, Optional, SkipSelf} from '@angular/core';
-import {Platform, PlatformModule} from '../../platform/index';
+import {ElementRef, Injectable, NgZone, Optional, SkipSelf} from '@angular/core';
+import {Platform} from '../../platform/index';
 import {Scrollable} from './scrollable';
 import {Subject} from 'rxjs/Subject';
 import {Observable} from 'rxjs/Observable';
@@ -143,12 +143,3 @@ export const SCROLL_DISPATCHER_PROVIDER = {
   deps: [[new Optional(), new SkipSelf(), ScrollDispatcher], NgZone, Platform],
   useFactory: SCROLL_DISPATCHER_PROVIDER_FACTORY
 };
-
-
-@NgModule({
-  imports: [PlatformModule],
-  exports: [Scrollable],
-  declarations: [Scrollable],
-  providers: [SCROLL_DISPATCHER_PROVIDER],
-})
-export class ScrollDispatchModule { }

src/lib/core/ripple/index.ts

@@ -2,7 +2,7 @@ import {ModuleWithProviders, NgModule} from '@angular/core';
 import {MdRipple} from './ripple';
 import {MdCommonModule} from '../common-behaviors/common-module';
 import {VIEWPORT_RULER_PROVIDER} from '../overlay/position/viewport-ruler';
-import {ScrollDispatchModule} from '../overlay/scroll/scroll-dispatcher';
+import {ScrollDispatchModule} from '../overlay/scroll/index';
 import {PlatformModule} from '../platform/index';
 
 export {MdRipple, RippleGlobalOptions, MD_RIPPLE_GLOBAL_OPTIONS} from './ripple';

src/lib/tabs/index.ts

@@ -12,7 +12,7 @@ import {MdInkBar} from './ink-bar';
 import {MdTabBody} from './tab-body';
 import {VIEWPORT_RULER_PROVIDER} from '../core/overlay/position/viewport-ruler';
 import {MdTabHeader} from './tab-header';
-import {ScrollDispatchModule} from '../core/overlay/scroll/scroll-dispatcher';
+import {ScrollDispatchModule} from '../core/overlay/scroll/index';
 
 
 @NgModule({