Decouple VR Shell DPR and CSS size from Physical Displays.

chrome/browser/android/vr_shell/vr_shell.h

Index: chrome/browser/android/vr_shell/vr_shell.h
diff --git a/chrome/browser/android/vr_shell/vr_shell.h b/chrome/browser/android/vr_shell/vr_shell.h
index c5fc1b7d55959b062303bff24e218587387e7022..0d9ffd107676920471b4f48c2add789d05c46354 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -89,18 +89,21 @@ class VrShell : public device::GvrDelegate {
   gvr::GvrApi* gvr_api() override;
   void SetGvrPoseForWebVr(const gvr::Mat4f& pose, uint32_t pose_num) override;
 
-  void ContentSurfaceChanged(
+  void SurfacesChanged(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& object,
-      jint width,
-      jint height,
-      const base::android::JavaParamRef<jobject>& surface);
-  void UiSurfaceChanged(
+      const base::android::JavaParamRef<jobject>& content_surface,
+      const base::android::JavaParamRef<jobject>& ui_surface);
+
+  void ContentBoundsChanged(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& object,
-      jint width,
-      jint height,
-      const base::android::JavaParamRef<jobject>& surface);
+      jint width, jint height);
+
+  void UIBoundsChanged(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& object,
+      jint width, jint height);
 
   // Called from non-render thread to queue a callback onto the render thread.
   // The render thread checks for callbacks and processes them between frames.
@@ -109,6 +112,9 @@ class VrShell : public device::GvrDelegate {
   // Perform a UI action triggered by the javascript API.
   void DoUiAction(const UiAction action);
 
+  void SetContentCssSize(float width, float height, float dpr);
+  void SetUiCssSize(float width, float height, float dpr);
+
  private:
   virtual ~VrShell();
   void LoadUIContent();