Add skeletal PdfViewWebPlugin

Creates a skeletal blink::WebPlugin counterpart to the Pepper-based
OutOfProcessInstance. This will support migrating the PDF viewer from a
Pepper plugin to a plain Blink plugin.

Note that the ultimate intent is _not_ to run the PDF viewer as a plain
Blink plugin, without other changes to isolate it. This is just a
starting point for the final implementation.

Bug: 1085334
Change-Id: I6bea3ddd7fc1b27879af5cd5614071cb02491d77
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2328030Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795565}

pdf/BUILD.gn

@@ -46,6 +46,7 @@ if (enable_pdf) {
       ":internal",
       ":out_of_process_instance",
       ":pdf",
+      ":pdf_view_web_plugin",
       "//base",
       "//ppapi/cpp:objects",
       "//ppapi/cpp/private:internal_module",
@@ -230,6 +231,25 @@ if (enable_pdf) {
     ]
   }
 
+  # Eventual replacement for out_of_process_instance.
+  source_set("pdf_view_web_plugin") {
+    visibility = [ ":*" ]
+
+    sources = [
+      "pdf_view_web_plugin.cc",
+      "pdf_view_web_plugin.h",
+    ]
+
+    configs += [ ":pdf_common_config" ]
+
+    deps = [
+      "//base",
+      "//cc/paint",
+      "//third_party/blink/public:blink_headers",
+      "//ui/base/cursor:cursor_base",
+    ]
+  }
+
   source_set("pdf_test_utils") {
     visibility = [ ":*" ]
 

pdf/DEPS

 include_rules = [
+  "+cc/paint",
   "+net",
   "+ppapi",
   "+printing/units.h",
+  "+third_party/blink/public",
   "+third_party/skia/include/core",
+  "+ui/base/cursor/cursor.h",
   "+ui/base/window_open_disposition.h",
   "+ui/events/keycodes/keyboard_codes.h",
   "+ui/gfx/geometry",

pdf/pdf_view_web_plugin.cc

+// Copyright 2020 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 "pdf/pdf_view_web_plugin.h"
+
+#include <stddef.h>
+
+#include "base/check_op.h"
+#include "cc/paint/paint_canvas.h"
+#include "third_party/blink/public/common/input/web_coalesced_input_event.h"
+#include "third_party/blink/public/common/metrics/document_update_reason.h"
+#include "third_party/blink/public/mojom/input/focus_type.mojom-shared.h"
+#include "third_party/blink/public/platform/web_input_event_result.h"
+#include "third_party/blink/public/platform/web_rect.h"
+#include "third_party/blink/public/platform/web_url_error.h"
+#include "third_party/blink/public/platform/web_url_response.h"
+#include "third_party/blink/public/web/web_plugin_container.h"
+#include "third_party/blink/public/web/web_plugin_params.h"
+#include "ui/base/cursor/cursor.h"
+
+namespace chrome_pdf {
+
+PdfViewWebPlugin::PdfViewWebPlugin(const blink::WebPluginParams& params) {}
+
+PdfViewWebPlugin::~PdfViewWebPlugin() = default;
+
+bool PdfViewWebPlugin::Initialize(blink::WebPluginContainer* container) {
+  DCHECK_EQ(container->Plugin(), this);
+  container_ = container;
+  return true;
+}
+
+void PdfViewWebPlugin::Destroy() {
+  container_ = nullptr;
+  delete this;
+}
+
+blink::WebPluginContainer* PdfViewWebPlugin::Container() const {
+  return container_;
+}
+
+void PdfViewWebPlugin::UpdateAllLifecyclePhases(
+    blink::DocumentUpdateReason reason) {}
+
+void PdfViewWebPlugin::Paint(cc::PaintCanvas* canvas,
+                             const blink::WebRect& rect) {}
+
+void PdfViewWebPlugin::UpdateGeometry(const blink::WebRect& window_rect,
+                                      const blink::WebRect& clip_rect,
+                                      const blink::WebRect& unobscured_rect,
+                                      bool is_visible) {}
+
+void PdfViewWebPlugin::UpdateFocus(bool focused,
+                                   blink::mojom::FocusType focus_type) {}
+
+void PdfViewWebPlugin::UpdateVisibility(bool visibility) {}
+
+blink::WebInputEventResult PdfViewWebPlugin::HandleInputEvent(
+    const blink::WebCoalescedInputEvent& event,
+    ui::Cursor* cursor) {
+  return blink::WebInputEventResult::kNotHandled;
+}
+
+void PdfViewWebPlugin::DidReceiveResponse(
+    const blink::WebURLResponse& response) {}
+
+void PdfViewWebPlugin::DidReceiveData(const char* data, size_t data_length) {}
+
+void PdfViewWebPlugin::DidFinishLoading() {}
+
+void PdfViewWebPlugin::DidFailLoading(const blink::WebURLError& error) {}
+
+}  // namespace chrome_pdf

pdf/pdf_view_web_plugin.h

+// Copyright 2020 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.
+
+#ifndef PDF_PDF_VIEW_WEB_PLUGIN_H_
+#define PDF_PDF_VIEW_WEB_PLUGIN_H_
+
+#include "third_party/blink/public/web/web_plugin.h"
+
+namespace blink {
+class WebPluginContainer;
+struct WebPluginParams;
+}  // namespace blink
+
+namespace chrome_pdf {
+
+// Skeleton for a `blink::WebPlugin` to replace `OutOfProcessInstance`.
+class PdfViewWebPlugin final : public blink::WebPlugin {
+ public:
+  explicit PdfViewWebPlugin(const blink::WebPluginParams& params);
+  PdfViewWebPlugin(const PdfViewWebPlugin& other) = delete;
+  PdfViewWebPlugin& operator=(const PdfViewWebPlugin& other) = delete;
+
+  // blink::WebPlugin:
+  bool Initialize(blink::WebPluginContainer* container) override;
+  void Destroy() override;
+  blink::WebPluginContainer* Container() const override;
+  void UpdateAllLifecyclePhases(blink::DocumentUpdateReason reason) override;
+  void Paint(cc::PaintCanvas* canvas, const blink::WebRect& rect) override;
+  void UpdateGeometry(const blink::WebRect& window_rect,
+                      const blink::WebRect& clip_rect,
+                      const blink::WebRect& unobscured_rect,
+                      bool is_visible) override;
+  void UpdateFocus(bool focused, blink::mojom::FocusType focus_type) override;
+  void UpdateVisibility(bool visibility) override;
+  blink::WebInputEventResult HandleInputEvent(
+      const blink::WebCoalescedInputEvent& event,
+      ui::Cursor* cursor) override;
+  void DidReceiveResponse(const blink::WebURLResponse& response) override;
+  void DidReceiveData(const char* data, size_t data_length) override;
+  void DidFinishLoading() override;
+  void DidFailLoading(const blink::WebURLError& error) override;
+
+ private:
+  // Call `Destroy()` instead.
+  ~PdfViewWebPlugin() override;
+
+  blink::WebPluginContainer* container_ = nullptr;
+};
+
+}  // namespace chrome_pdf
+
+#endif  // PDF_PDF_VIEW_WEB_PLUGIN_H_