Bug 912121 - Migrate major DevTools directories. rs=devtools

Move major DevTools files to new directories using the following steps:

hg mv browser/devtools devtools/client
hg mv toolkit/devtools/server devtools/server
hg mv toolkit/devtools devtools/shared

No other changes are made.

devtools/client/canvasdebugger/panel.js

@@ -0,0 +1,76 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const { Cc, Ci, Cu, Cr } = require("chrome");
+const promise = require("promise");
+const EventEmitter = require("devtools/toolkit/event-emitter");
+const { CanvasFront } = require("devtools/server/actors/canvas");
+const DevToolsUtils = require("devtools/toolkit/DevToolsUtils");
+
+function CanvasDebuggerPanel(iframeWindow, toolbox) {
+  this.panelWin = iframeWindow;
+  this._toolbox = toolbox;
+  this._destroyer = null;
+
+  EventEmitter.decorate(this);
+};
+
+exports.CanvasDebuggerPanel = CanvasDebuggerPanel;
+
+CanvasDebuggerPanel.prototype = {
+  /**
+   * Open is effectively an asynchronous constructor.
+   *
+   * @return object
+   *         A promise that is resolved when the Canvas Debugger completes opening.
+   */
+  open: function() {
+    let targetPromise;
+
+    // Local debugging needs to make the target remote.
+    if (!this.target.isRemote) {
+      targetPromise = this.target.makeRemote();
+    } else {
+      targetPromise = promise.resolve(this.target);
+    }
+
+    return targetPromise
+      .then(() => {
+        this.panelWin.gToolbox = this._toolbox;
+        this.panelWin.gTarget = this.target;
+        this.panelWin.gFront = new CanvasFront(this.target.client, this.target.form);
+        return this.panelWin.startupCanvasDebugger();
+      })
+      .then(() => {
+        this.isReady = true;
+        this.emit("ready");
+        return this;
+      })
+      .then(null, function onError(aReason) {
+        DevToolsUtils.reportException("CanvasDebuggerPanel.prototype.open", aReason);
+      });
+  },
+
+  // DevToolPanel API
+
+  get target() {
+    return this._toolbox.target;
+  },
+
+  destroy: function() {
+    // Make sure this panel is not already destroyed.
+    if (this._destroyer) {
+      return this._destroyer;
+    }
+
+    return this._destroyer = this.panelWin.shutdownCanvasDebugger().then(() => {
+      // Destroy front to ensure packet handler is removed from client
+      this.panelWin.gFront.destroy();
+      this.emit("destroyed");
+    });
+  }
+};