[DevTools] Handle emulation in embedder, call into web API.

content/browser/devtools/protocol/page_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/devtools/protocol/page_handler.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/strings/string16.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/worker_pool.h"
 #include "content/browser/devtools/protocol/color_picker.h"
 #include "content/browser/devtools/protocol/frame_recorder.h"
 #include "content/browser/geolocation/geolocation_service_context.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 77 matching lines @@
   return base_64_data;
 }
 
 }  // namespace
 
 typedef DevToolsProtocolClient::Response Response;
 
 PageHandler::PageHandler()
     : enabled_(false),
       touch_emulation_enabled_(false),
+      device_emulation_enabled_(false),
       screencast_enabled_(false),
       screencast_quality_(kDefaultScreenshotQuality),
       screencast_max_width_(-1),
       screencast_max_height_(-1),
       capture_retry_count_(0),
       has_compositor_frame_metadata_(false),
       screencast_frame_sent_(0),
       screencast_frame_acked_(0),
       processing_screencast_frame_(false),
       color_picker_(new ColorPicker(base::Bind(
           &PageHandler::OnColorPicked, base::Unretained(this)))),
       frame_recorder_(new FrameRecorder()),
       host_(nullptr),
       weak_factory_(this) {
 }
 
 PageHandler::~PageHandler() {
 }
 
 void PageHandler::SetRenderViewHost(RenderViewHostImpl* host) {
   if (host_ == host)
     return;
 
   color_picker_->SetRenderViewHost(host);
   frame_recorder_->SetRenderViewHost(host);
   host_ = host;
   UpdateTouchEventEmulationState();
+  UpdateDeviceEmulationState();
 }
 
 void PageHandler::SetClient(scoped_ptr<Client> client) {
   client_.swap(client);
 }
 
 void PageHandler::Detached() {
   Disable();
 }
 
@@ skipping 30 matching lines @@
 
 Response PageHandler::Enable() {
   enabled_ = true;
   return Response::FallThrough();
 }
 
 Response PageHandler::Disable() {
   enabled_ = false;
   touch_emulation_enabled_ = false;
   screencast_enabled_ = false;
+  device_emulation_enabled_ = false;
   UpdateTouchEventEmulationState();
+  UpdateDeviceEmulationState();
   color_picker_->SetEnabled(false);
   return Response::FallThrough();
 }
 
 Response PageHandler::Reload(const bool* ignoreCache,
                              const std::string* script_to_evaluate_on_load,
                              const std::string* script_preprocessor) {
   if (!host_)
     return Response::InternalError("Could not connect to view");
 
@@ skipping 138 matching lines @@
 #endif  // defined(OS_ANDROID)
   return Response::OK();
 }
 
 Response PageHandler::CanEmulate(bool* result) {
 #if defined(OS_ANDROID)
   *result = false;
 #else
   if (host_) {
     if (WebContents* web_contents = WebContents::FromRenderViewHost(host_)) {
-      *result = !web_contents->GetVisibleURL().SchemeIs(kChromeDevToolsScheme);
+      *result = web_contents->GetMainFrame()->GetRenderViewHost() == host_;
+#if defined(DEBUG_DEVTOOLS)
+      *result &= !web_contents->GetVisibleURL().SchemeIs(kChromeDevToolsScheme);
+#endif  // defined(DEBUG_DEVTOOLS)
     } else {
       *result = true;
     }
   } else {
     *result = true;
   }
 #endif  // defined(OS_ANDROID)
   return Response::OK();
 }
 
 Response PageHandler::SetDeviceMetricsOverride(
     int width, int height, double device_scale_factor, bool mobile,
     bool fit_window, const double* optional_scale,
     const double* optional_offset_x, const double* optional_offset_y) {
-  return Response::FallThrough();
+  const static int max_size = 10000000;
+  const static double max_scale = 10;
+
+  if (!host_)
+    return Response::InternalError("Could not connect to view");
+
+  if (width < 0 || height < 0 || width > max_size || height > max_size) {
+    return Response::InvalidParams(
+        "Width and height values must be positive, not greater than " +
+        base::IntToString(max_size));
+  }
+
+  if (device_scale_factor < 0)
+    return Response::InvalidParams("deviceScaleFactor must be non-negative");
+
+  if (optional_scale && (*optional_scale <= 0 || *optional_scale > max_scale)) {
+    return Response::InvalidParams(
+        "scale must be positive, not greater than " +
+        base::IntToString(max_scale));
+  }
+
+  blink::WebDeviceEmulationParams params;
+  params.screenPosition = mobile ? blink::WebDeviceEmulationParams::Mobile :
+      blink::WebDeviceEmulationParams::Desktop;
+  params.deviceScaleFactor = device_scale_factor;
+  params.viewSize = blink::WebSize(width, height);
+  params.fitToView = fit_window;
+  params.scale = optional_scale ? *optional_scale : 1;
+  params.offset = blink::WebFloatPoint(
+      optional_offset_x ? *optional_offset_x : 0.f,
+      optional_offset_y ? *optional_offset_y : 0.f);
+
+  if (device_emulation_enabled_ && params == device_emulation_params_)
+    return Response::OK();
+
+  device_emulation_enabled_ = true;
+  device_emulation_params_ = params;
+  UpdateDeviceEmulationState();
+  return Response::OK();
 }
 
 Response PageHandler::ClearDeviceMetricsOverride() {
-  return Response::FallThrough();
+  if (!device_emulation_enabled_)
+    return Response::OK();
+
+  device_emulation_enabled_ = false;
+  UpdateDeviceEmulationState();
+  return Response::OK();
 }
 
 Response PageHandler::StartScreencast(const std::string* format,
                                       const int* quality,
                                       const int* max_width,
                                       const int* max_height) {
   if (!host_)
     return Response::InternalError("Could not connect to view");
 
   screencast_enabled_ = true;
@@ skipping 82 matching lines @@
   bool enabled = touch_emulation_enabled_ || screencast_enabled_;
   ui::GestureProviderConfigType config_type =
       TouchEmulationConfigurationToType(touch_emulation_configuration_);
   host_->SetTouchEventEmulationEnabled(enabled, config_type);
   WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
       WebContents::FromRenderViewHost(host_));
   if (web_contents)
     web_contents->SetForceDisableOverscrollContent(enabled);
 }
 
+void PageHandler::UpdateDeviceEmulationState() {
+  if (!host_)
+    return;
+  if (device_emulation_enabled_) {
+    host_->Send(new ViewMsg_EnableDeviceEmulation(
+        host_->GetRoutingID(), device_emulation_params_));
+  } else {
+    host_->Send(new ViewMsg_DisableDeviceEmulation(host_->GetRoutingID()));
+  }
+}
+
 void PageHandler::NotifyScreencastVisibility(bool visible) {
   if (visible)
     capture_retry_count_ = kCaptureRetryLimit;
   client_->ScreencastVisibilityChanged(
       ScreencastVisibilityChangedParams::Create()->set_visible(visible));
 }
 
 void PageHandler::InnerSwapCompositorFrame() {
   if (screencast_frame_sent_ - screencast_frame_acked_ >
       kMaxScreencastFramesInFlight || processing_screencast_frame_) {
@@ skipping 129 matching lines @@
 
 void PageHandler::OnFramesRecorded(
     DevToolsCommandId command_id,
     scoped_refptr<StopRecordingFramesResponse> response_data) {
   client_->SendStopRecordingFramesResponse(command_id, response_data);
 }
 
 }  // namespace page
 }  // namespace devtools
 }  // namespace content