Refactor TabContentManager to async create ThumbnailCache.

chrome/browser/android/compositor/tab_content_manager.h

Index: chrome/browser/android/compositor/tab_content_manager.h
diff --git a/chrome/browser/android/compositor/tab_content_manager.h b/chrome/browser/android/compositor/tab_content_manager.h
index df4f89749c118acb4679f88a55aebc372be62113..e6e28417c07fa409b5fa4fdcb46e419a033f7c41 100644
--- a/chrome/browser/android/compositor/tab_content_manager.h
+++ b/chrome/browser/android/compositor/tab_content_manager.h
@@ -37,13 +37,7 @@ class TabContentManager : public ThumbnailCacheObserver {
   static TabContentManager* FromJavaObject(jobject jobj);
 
   TabContentManager(JNIEnv* env,
-                    jobject obj,
-                    jstring disk_cache_path,
-                    jint default_cache_size,
-                    jint approximation_cache_size,
-                    jint compression_queue_max_size,
-                    jint write_queue_max_size,
-                    jboolean use_approximation_thumbnail);
+                    jobject obj);
 
   virtual ~TabContentManager();
 
@@ -73,6 +67,14 @@ class TabContentManager : public ThumbnailCacheObserver {
   // Callback for when the thumbnail decompression for tab_id is done.
   void OnFinishDecompressThumbnail(int tab_id, bool success, SkBitmap bitmap);
   // JNI methods.
+  void CreateThumbnailCache(JNIEnv* env,
+                            jobject obj,
+                            jstring disk_cache_path,
+                            jint default_cache_size,
+                            jint approximation_cache_size,
+                            jint compression_queue_max_size,
+                            jint write_queue_max_size,
+                            jboolean use_approximation_thumbnail);
   jboolean HasFullCachedThumbnail(JNIEnv* env, jobject obj, jint tab_id);
   void CacheTab(JNIEnv* env,
                 jobject obj,
@@ -102,6 +104,7 @@ class TabContentManager : public ThumbnailCacheObserver {
   typedef base::ScopedPtrHashMap<int, scoped_ptr<TabReadbackRequest>>
       TabReadbackRequestMap;
 
+  ThumbnailCache* GetThumbnailCache();
   void PutThumbnailIntoCache(int tab_id,
                              float thumbnail_scale,
                              const SkBitmap& bitmap);