WebVR: add explicit texture delete, fix formatting

chrome/browser/android/vr_shell/mailbox_to_surface_bridge.cc

 // Copyright 2017 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 "chrome/browser/android/vr_shell/mailbox_to_surface_bridge.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 10 matching lines @@
 #include "services/ui/public/cpp/gpu/context_provider_command_buffer.h"
 #include "ui/gl/android/surface_texture.h"
 
 #include <android/native_window_jni.h>
 
 #define VOID_OFFSET(x) reinterpret_cast<void*>(x)
 #define SHADER(Src) #Src
 
 namespace {
 
+/* clang-format off */
 const char kQuadCopyVertex[] = SHADER(
-    /* clang-format off */
     attribute vec4 a_Position;
     attribute vec2 a_TexCoordinate;
     varying vec2 v_TexCoordinate;
     void main() {
       v_TexCoordinate = a_TexCoordinate;
       gl_Position = a_Position;
     }
-); /* clang-format on */
+);
 
 const char kQuadCopyFragment[] = SHADER(
-    /* clang-format off */
     precision highp float;
     uniform sampler2D u_Texture;
     varying vec2 v_TexCoordinate;
     void main() {
       gl_FragColor = texture2D(u_Texture, v_TexCoordinate);
     }
-); /* clang-format on */
+);
 
 const float kQuadVertices[] = {
-    // clang-format off
     // x     y    u,   v
     -1.f,  1.f, 0.f, 1.f,
     -1.f, -1.f, 0.f, 0.f,
      1.f, -1.f, 1.f, 0.f,
      1.f,  1.f, 1.f, 1.f};
+/* clang-format on */
+
 static constexpr int kQuadVerticesSize = sizeof(kQuadVertices);
 
 GLuint CompileShader(gpu::gles2::GLES2Interface* gl,
                      GLenum shader_type,
                      const GLchar* shader_source) {
   GLuint shader_handle = gl->CreateShader(shader_type);
   if (shader_handle != 0) {
     // Pass in the shader source.
     GLint len = strlen(shader_source);
     gl->ShaderSource(shader_handle, 1, &shader_source, &len);
@@ skipping 163 matching lines @@
     return false;
   }
 
   if (needs_resize_) {
     ResizeSurface(resize_width_, resize_height_);
     needs_resize_ = false;
   }
 
   GLuint sourceTexture = ConsumeTexture(gl_, mailbox);
   DrawQuad(sourceTexture);
+  gl_->DeleteTextures(1, &sourceTexture);
   gl_->SwapBuffers();
   return true;
 }
 
 void MailboxToSurfaceBridge::DestroyContext() {
   gl_ = nullptr;
   context_provider_ = nullptr;
 }
 
 void MailboxToSurfaceBridge::InitializeRenderer() {
@@ skipping 84 matching lines @@
   // GL_NEAREST.
   gl_->BindTexture(GL_TEXTURE_2D, texture_handle);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   gl_->DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 }
 
 }  // namespace vr_shell